This TechCrunch review has a link to a raw .dng image file from the 15 Pro Max 120mm 5x tetraprism lens:
Since 2014, I’ve been reviewing Apple’s latest iPhones at Disneyland. The rationale was, and is, simple: Instead of lab tests, do my best to get a feeling
techcrunch.com
The link to the raw file is about halfway through the review, of a neon sign at night.
(The YouTube video linked in the review is misleading: much or most of it was taken with a non-iphone camera, indicated in VERY fine print at the bottom "shot on professional camera".)
The sensor in the 15 Pro Max 120mm camera (1.12 micron) is 25% larger area than the sensor in the 14 or 15 Pro 77 mm camera (1.0 micron).
According to the exif info from the 120mm raw .dng file from the review, the color depth is 10 bit.
"Bits Per Sample : 10 10 10"