Opinion: Easily the best compact mirrorless camera currently in terms of image quality. Repeat. Superb image quality in a small form factor is the foremost advantage of this little camera. The other advantages are the flexibility/customisation features of Ricoh interface (which has its own cult following): almost every button can be configured to your tastes (it has more options than Ricoh GRD3 even!). I have not used a more customisable camera. The LCD and EVF both are 902k pixels, truly DLSR resolution, which surpass the Leica X1 & Oly EP-2 (both 206k pixels), and Panasonic GF1 (460k pixels). The significance here is that 902k is very effective for manual focusing
Problems: 1. Slow AF under (i) dim light; or (ii) subject close proximity to lens. However, the slow AF is still faster than Leica X1. The GXR A12 is not an ideal camera for street photography or moving subjects like children. However, if you do still photography or if your subject poses for you, this is an exception camera for its form factor.
2. During AF, the image on both LCD/EVF will freeze. This means you cannot see the image during AF. The image only revives movement after the AF is obtained. Again this is a significant drawback for snapshot aesthetics with a need to capture moving subjects.