I was checking the DxO sensor comparison tool the other day and an interesting pattern emerged: There seems to be noo new major development in :43: sensor performance since the E-M5 was introduced. The GX7 seems to be roughly equivalent to the E-M5 and latest Pens (in fact, slightly inferior, but no big deal) and we have no reason to believe the E-M1 shall improve things very much. Improvements have been marginal; interestingly, the E-PM2 seems to have the best ISO performance among all :43: cameras, but indeed such differences are nothing to talk about. Also, any real world improvement seems to come from software upgrades in the image processor. There is a certain pattern between different formats. :43: seems to be about between 1/3 to less than 1/2 of a stop behind the best APS-C sensors in ISO performance (fairly trivial in the real world). APS-C is also better by about one bit in color depth (best sensors compared). The same pattern exists in comparing APS-C with FF. The best APS-C sensors trail the best FF by about 1 1/2 to 1 2/3 stop in ISO and 1,5 bit in color depth. Where things differentiate is in maximum dynamic range. :43: is 1 1/2 stop behind the best APS-C where the latter is not only comparable with FF but in many cases much better. Furhtermore, the best 1" sensor seems to match the best :43: in color depth and dynamic range, only being inferior in ISO performance (by about one stop). Cameras used for this comparison were the Sony RX100ii, Olympus E-P5, Pentax K-5iis and Nikon D800E. I don't know if this link would work for you: http://www.dxomark.com/Cameras/Comp...d2)/Olympus/(appareil3)/830|0/(brand3)/Pentax I understand this is not the whole story about final image quality: apart from the obvious lens choice issue, there are also image engine matters, etc. I'm just trying to understand how sensor size relates to certain sensor performance parameters, more specifically (max) color depth and dynamic range.