I am in love with this thing. The viewfinder is unbelievable. It is not going to replace my D300 but the G11 is going away.
I just posted a set of photos on my flickr account. The link to my flickr account is on my profile page. Click my name and you will see them.
Note that wind gusts were 30-40mph here when shooting and I shot handheld so it was hard to be razor sharp images. I also only shot in Jpeg since I have not had time to load it raw converter. I have read that RAW files are 10x better. And these files are fantastic to begin with. I have pushed jpeg 4 stops either way with out artifacts. D300 files can't handle that.
Quirks? Well yes and no. Nothing different then what every camera has and you learn to work with it. Everyone has their personal quirks of what they can tolerate and what they can not live with. So far out of the reviews I have read, the sticking points on DSLRs are the same one's they point out with the X100. Some people are just whiny. Everyone needs to understand that: 1) THIS IS NOT A DSLR and it was not intended to replace one. 2) IT IS NOT A LEICA OR A RANGEFINDER. Once people get past that, it is a great camera. Steve Huff has a great review that I agree with 100%. If you really want to get into it, it is a great one to read.
Only two quirks I'm catching is the AF does miss a fair amount and takes a bit to lock. Very noticeable when using a DSLR at the same time. G11 and Iphone were worse. The second is that in really bright sunlight the viewfinder lines and such are hard to see. I kick it over to the EVF which is a toggle switch and BAM perfect.
The photoblogger and others go into the metering. I noticed this also. In aperture priority mode (in the manual) the shutter does not go above 1/0000. Fix - Turn the damn shutter dial to 2000, 4000 or the exposure compensation button. It is all there on top. Or turn on the ND filter. I think if they read the manual and took 10 min to play with it they would get past everything.
This camera is not intended to replace either of those systems.
Against a m4/3 - blows them away on everything.
Nex - I have not used so I can't say.
G11 - blows it away.
P7000 - blows it away.
Every compact I have used - blows it away.
No edits at all. ISO 3200 - Velva