Amazed. Can't see the benefit of FF.
I think RF photography is best practised using some math😎, and the 1.33 crop on the M8 is just too simple:
12mm=16mm,
15mm=20mm,
21mm=28mm,
28mm=37mm,
35mm=47mm,
50mm=67mm (extra focal length, slight portrait tele),
90mm=120mm,
135mm=180mm
So, for any film body lens, simply pick the next focal length up to know what it will look like on the 1.33 sensor.
The 50mm will turn into a nice small tele lens, perfectly suited for portraits. The only focal difference worthy of mentioning is the 90mm turning into a 120mm, which is an odd one out.
Now, the inadequate frame lines and the bloody IR-cut filters on the M8, those are a reason to get the M9!
Olsen, I would have sold the M8's instead of the ZI when you mind remembering the crop factor. That would have done away with the problem forgood. And the 21mm you love would still have been a 21mm on the M9.