It certainly hasn't impacted my stock sales since I made the switch. Of course, my images are rarely ever printed larger than 16x20. If I was shooting for fashion magazine covers, 30+" prints or billboards it would make a difference but then I would probably be shooting Phase One or Pentax 645Z medium format and "full frame" would not be good enough. For most travel photos, m4/3 image quality is just fine. The main differences tend to be behind the camera anyway, not inside.

Back in the 70s and 80s I hauled my Canon F-1, several lenses and too many rolls of slide film up big mountains and around some remote back country. I am not that 30-something anymore so some changes have been in order.

Like you, I have found that I can once again carry all the gear I need to do my best, now that it all weighs so much less and takes up so much less space. It is almost as if I were 50 again.