http://dedpxl.com/fuji-x-buyers-guide-part-2-lenses/
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OP has chosen the big gun. Look at the heft of that bad boy versus pretty much every other XF lens![]()
I have found the NEX5 R fantastic especially with the 18-200 , the only thing is its AF is slow , it's really hard to catch anything moving .Not sure the E-M1 would significantly upgrade your NEX5R image quality tbh.
I don't mean to be vague, I really do use my Sony for everything with one lens , I have tried a few other lenses with it but the 18-200 works best for me as a novice .My personal choice for only one lens would be the 23mm prime, but that's because I know what I shoot. I don't know what you shoot though and you don't seem to want to give us that information, you say motorsport sometimes which to me suggests it won't be the main use? Without more information we cannot answer or even suggest options![]()
Christ I didn't realise the 50-140 was THAT big, that's a monster!
I don't mean to be vague, I really do use my Sony for everything with one lens , I have tried a few other lenses with it but the 18-200 works best for me as a novice .
@simonblue has both systems.
I shot motorsport with the X-T1 and 50-140 and found it very capable. It's a little short though but the release of the teleconverter will help. The 1xx-400mm lens will also be a welcome addition.
M4/3 is a very sharp system indeed. I dare say the new PRO lenses are some of the best available from any manufacturer. The latest FW from Olympus helped with AF-C but i don't think it's up there with Fuji's X-T1/X-T10 AF-C.