I'm probably in the minority here but I shoot an X-P1 and only use adapted lenses. In fact I've been shooting adapted lenses for several
years on various mirror-less bodies. I think Fuji native lenses are terrific but all of my lenses combined cost less than a Fuji 35/1.4 (which
I did have for a while). I also think it is perfectly doable to go MF. The last time I looked Leica M cameras were still all MF. I don't shoot a
lot of action but I have been able to get a number of candid of both 13 year old and my hyper active terrier so it's not impossible to do. It
just takes a bit of anticipation.
At the moment I have (Nikon wise) an HC 50/2 and a 28/2 AiS. I'll probably be picking up a Nikkor-O 35/2 and/or Nikkor N 24/2.8 in the
near future as well. The most significant drawback is the lack of a good WA option when shooting adapted lenses. I myself almost never
shoot WA so it's not a problem. On the rare occasion I want a wide shot I will use my 28 and create a short panorama. My 28/2 is my
normal lens and the 50/2 is a short telephoto. For the kinds of things I want to for it works great. Image quality wise, I find the Nikon
lenses to very impressive. They don't have the modern look that native lenses do but they produce great results none the less.