But going for a camera with a smaller sensor means he can get smaller lenses that still covers a wide range of focal length. The f/40 is small but does only cover a very limited type of photography since it isn't possible to get wider without lots and lots of photo stitching. And it isn't possible to get longer, without lots and lots of cropping.
The thread title is "Second system" - and a DSLR that is only allowed to use a f/40 isn't really a system anymore, since it represents a concept where he is locked to a fixed lens.
This was my thinking as well. I know I can't expect miracles out of a mirror less system so the bif will be less so of an expectation. 2 votes for the Panasonic. I will def look into this camera. Thanks all for the input