I found my X100 was soft at f/2. This wasn't always a problem for me though, sometimes that's a nice look (my wife would prefer all shots of her be "softer") when shooting closer in to maximize the ability to throw background detail out of focus. When my X100 started suffering from sticky aperture blade syndrome on a long trip, I was left with a softish f/2.0 camera for the balance. Unfortunately that look isn't suitable for everything.
Comparing the X100 to a NEX-5N with a Zeiss 25mm mounted... I'm liking the sharpness I get out of that combo.
I can't put my finger on it but I believe the two lens assemblies I had were not the best examples of what is out there in X100 land. Even shot tripod mounted with the best technique I wasn't able to get the sort of sharpness I'd seen in other peoples work, and for some subjects this mattered to me. My perception of the camera's ability to deliver sharp results (mostly landscape) did not cause me to abandon the X100, but was one factor in my mind.
What set me on the "handful of cameras" (tying this back into the thread after all) crusade was a desire to be able to choose the lens up front rather than be dependent on the camera maker for that choice.
Unlike christilou, I do hope to find a compact camera that "does it all" where "does it all" simply means replaces a DSLR in a more compact shape, with an APS-C or larger sensor. I'm willing to forgo one of the principle DSLR advantages - usually faster AF - but don't want to give up the utility of a built in viewfinder. Or a hot shoe for flash, which can't be used by an accessory viewfinder.
As soon as there is a camera that has decent controls that a photographer can appreciate, with a built in viewfinder (even if its an EVF), M9 size or thereabouts is fine, it doesn't need to be tiny at all, just slimmer than a DSLR, that can mount any rangefinder or manual glass (a la NEX) but at least my M lenses, has a hot shoe not co-opted for other purposes (I do sometimes shoot with a wireless trigger), that has at least a minimum amount of buffering such that shot to shot time isn't stupidly long (hey, Fujifilm, Ricoh, I'm talkin' at ya)... then I'll get off the Handful of Camera train or Current Compromise Camera carousel.
In other words, take any competent DSLR design, chuck the mirror, slim it down, and replace the OVF with an EVF built in and we are done. That's not asking too much, is it?
Perhaps 2011 was just a little early; the NEX-7 *might* be the first that hits the target (depending on M lens performance) but clearly it is the closest at this point. GXR next, but no built in EVF.
So I'm using a compromise camera. Funny, when I write about the 5N and what I don't like about it, it feels like a compromise, but generally when I shoot with it, I don't think about its short comings at all. I guess that's a good sign... it is close, just not quite there - for me, mostly that's ergonomics and the lack of a proper hot shoe.
On the plus side, until the NEX-7 ships and/or the wide angle rangefinder lens on the 7 issue is decided once and for all, or some future camera from Ricoh or ? ships, there literally isn't anything on the market that meets my "competent APS-C DSLR downsized" definition, so resisting buying any others is really quite easy.