Steve,
Are you not happy with the XPro-1?
I've been a Leica user for the best part of 20 years (mainly M2/3 and M6), and I've had an M8 since 2006, so it's more a case of feeling more comfortable with that system. There are some features of the Fuji that I like - the single electronic framelines is something I thought Leica would introduce at some point - but it's not the same. That's why I'm not going to rush into getting out of the system, it may win me over in time.
As for the lenses, I only have two. The 18mm that came with the body, and isn't that good at the edges, and the 35mm lens that I chose as my 'free' one when I bought the camera. The 35mm lens is much better, though they are both larger than similar M lenses (but lighter).
I bought the Leica M adaptor, but that means I have to use the EVF, and while it's better than other EVFs that I've used it's still nowhere near as good as a 'proper' SLR. The other thing is that I find the EVF rather dark in daylight, that's possibly just a setting somewhere as it's fine in low light.
I've found it very easy to accidently move the exposure compensation wheel when taking the camera out of the camera bag, to the extent that it's something I check now before switching the camera on.
The good things? Well, the high ISO is much, much, better than my M8 - and I expect an M9 - but I never shot much above ISO 400 in my film days.
So overall it's still a work in progress, lets see what the rest of the year brings.