I'll echo what a lot of others have said, which is that the G82 is a massive upgrade across every part of the driving experience. Two of the biggest gripes with my F82 was that the interior felt dated and less sophisticated, and the backend just never felt adequate enough to handle even my non-competition M4.
Now with AWD, my G82 is a rocket. The car feels a ton more planted with daily driving, and when I want to lay down power it just claws the road and pulls the earth closer to me with each millimeter of the accelerator.
The interior feels so much more like a luxury car that happens to have supercar performance as well as amazing technology designed to keep me alive. The all-digital instrument cluster is something I railed against 10 years ago, but once I saw it in other BMW models I couldn't look at my F82's analog cluster the same way.
Daily driving has actually earned a nod of approval from my wife, who constantly felt the F82 was too "jerky" with street driving, and that's even though I always drove in "comfort" mode with her. Strangely, even though I spec'd the carbon buckets seats, which I thought would provide even less comfort, she feels the car is actually smoother and more comfortable to be in. Part of me wonders whether that may be due to the CCB's I spec'd. Engineering Explained did a great video explaining the virtues of CCB's, and the many points he covers make me wonder whether all those merits help to make this new car feel more comfortable despite the leaner/firmer seats.
Whatever is making this more comfortable for my wife leaves me very pleased, because the carbon bucket seats are practically my favorite thing about the car and I was genuinely worried it would be a bad decision on the comfort side.
Exterior looks: it's obviously night and day. To me, this damn thing looks so much more aggressive. I loved it the moment it debuted. I was/is one of those who felt like the new grills were immensely good at increasing the aggressiveness and looks of the car. My F82 changed from looking "cool" to feeling like an older car that was sedated. And like many others here and in Instagram, I have heard precisely zero unfavorable comments on the looks from when I'm out and about. It turns so many heads from so many walks of life, and I can't count how many times I'm in a parking lot and someone wants to chat about the car.
Sound system: there are many on this forum who don't like the new system, but to me it is a big step up above the F82's "upgraded" sound system (that was an option on my F82 and I had it, whereas now they just give you the Harmon Kardon system by default). I swear, right after delivery when I tuned my equalizer and other sound settings, I re-listened to old songs because the new system allowed me to hear/feel things that weren't present before, even with our multi-speaker Sonos system at home.
Transmission: I lamented the choice to ditch DCT but in practice I don't miss it. This new ZF transmission is fast and smooth and doesn't leave me pining for DCT anymore. Maybe I was doing it wrong with my F82, but with the new ZF I find that it kicks down to the right gear so much better than the DCT. Gear selection is simply fast and accurate for what gear I need based on my sudden accelerator position, and this is coming from not using the most aggressive selection (I always use the 2nd level for the transmission).
Sound: say what you will about the exhaust and the piped-in sound into the cabin, but the driving experience is just massively fun with this new G82 in Sport Plus. Piping in sound through the speakers isn't new to the G8x platform, as I enjoyed the F82's sound in/out, but it's something that allows me to drive with immersive sound on acceleration and yet I'm not drawing the ire of all the cops within earshot. The actual sound from the tailpipe is an improvement as well. My usual driving buddy who owns a Nizmo Z says the F82 sounded like a fart can, whereas he puts this new platform on par with exotic cars. He's a sample size of one, but I'll take it.
Power delivery: yes, the F82 achieving max torque at 1850 rpms was fantastic. But with the G82, once you're passed 3K rpms, the rocket characteristics takeover. And with shorter gears (and eight of them to boot), once you're passed 3K in first gear, each subsequent shift leaves you in the right rpm range to continue the thrill of acceleration. The delivery itself feels closer to an NA car and yet still retains the turbo feel I've grown to love. I grew up with NA cars and thought they were the best. But putting your foot down and feeling a relatively constant level of acceleration through the rpm range always lacked something that I couldn't quite place. With twin turbos, as the rpms rise and the sound theater sings louder and louder, you get that boost feeling where each 1K gain in rpm just shoves you back further in your seat. 5K rpms is great, and then 6K is just louder and faster still. What's different between the F82 and G82 is the shorter gears, and that engineering decision imparts a more racy feel where changing gears at higher rpms doesn't drop the sound level as far as the F82 did. You still feel like you're in an aggressive rpm range that teases you to keep hammering the throttle. The F82 just didn't do it as well as this one.
I really loved my F82 but this new one is an extraordinary machine and an upgrade across every single part of the car. To each their own for sure, but I am one happy camper.