I went by my local dealer (BMW of Annapolis) to ask them a question and parked next to a '22 M3 in Tanzanite Blue II they had on the lot for sale. I took a few quick cellphone pictures near dusk to capture the difference in color versus San Marino Blue. Thought the crowd here might be interested to see the comparison.
Before getting my car I test drove a used M3 in TBII and loved the color on a bright sunny day. I'm glad I went SMB but still think TBII is gorgeous.
Shot with my Samsung S21, default settings.