I've mentioned the Ricoh GR twice before (here and here) and both of those posts got a lot of attention. I'm a little surprised, actually, that so many people are paying attention to the GR or really anything from Ricoh, because it isn't Canon, Nikon, Fuji or Sony. There are a lot of great cameras out there made by the less-looked-at companies, and these cameras certainly shouldn't be overlooked.
But the GR, especially, has caused a stir. I think the reason why is that people want to know if it is indeed a legitimate alternative to the Fuji X100, Fuji X100s, Leica X1 and the Leica X2. Those four cameras are popular with street photographers who want a compact camera that delivers exceptionally sharp images. The problem with those cameras, however, is their price-tag (especially the Leica models). Along comes a similar camera that is priced much, much less, and people want to know if it performs close to the same.
The Ricoh GR also competes directly against the Sigma DP3, although these two cameras are a little less similar than the ones previously mentioned.
So I searched the web for hands-on reviews of the Ricoh GR and linked them here. While I'm sure I missed a few reviews (and new ones will come out after I post this), hopefully this list will be helpful to those considering the camera.
In no particular order, here are reviews of the Ricoh GR:
Steve Huff Photo
Digital Camera World
Eric Kim Photography
Digital Photography Review
DxoMark Camera and Lens
Ming Thein Photography
Digital Photography School
Alex Coghe Photography
Natural Light Photography
My Orange Brompton
As you can see, there is no shortage of information or opinions. The fast is, you should ignore each of those links and not waste your time researching cameras. Your camera doesn't really matter. Vision is what's important. Otherwise, I hope the links were helpful.