I currently use the loxia 35mm as my sole lens when moving light, and with S35 and 2x clear zoom it covers from 35mm to 100mm. That lens is sharp enough for this extensive cropping. Very useful.  I also found out that my SLR Magic 25mm T/0.95 is perfect with just S35 mode (no zoom) and the wide aspect ratio of 2.40:1 which crops the problematic corners. That makes it a great compact and low light combination with an effective 35mm.  Here is a video from P.Bloom with A7rii, 400mm lens, S35 mode a