There are few things I didn't like about G8X design, and the mirrors are one of them!
It's not that they are bad looking, they have that Batman vibe to it, but the problem is that they are just standard 4 series mirrors with added upper "spike"!
That is BMW's cost cutting measure, and they did it first on the F90 M5.
I didn't like that M5 mirrors, and in person they looked like an add on!
I haven't seen M3/4 in person, but its interpretation of the standard mirror is much better, at least on the photos.
On the flip side, that mirrors are more practical (bigger), and I hate poor visibility no matter how good they look, and wouldn't trade the looks for the practicality in that department.