I must sayin was impressed seriously with the 5d3, the only thing I didn't like because the 5d2 was better was IQ.. people needed to really try to say the 5d3 had better IQ! But it has marginal better color, and less sharp, same res, same noise under 1600 and less DR. I'mpI'm pretty sure everybody expected and iq upgrade like the one from 5dc to 5d2...
Granted that the improvement in IQ of the 5D2 over the 5DC was greater than between the 5D3 and 5D2, it still wasn't that dramatic. According the DxO, the 5D2 has 0.8 extra stop of DR, and 0.8 additional bits of color depth. Even DxO states that "differences below 1 bit are barely noticeable." That said, there was a huge jump in resolution between the 5DC and MK2, but not many people were saying they needed more resolution out of the MK3.
Sensors aside, IMHO the improvement in the overall camera is much greater between the 5D3 and 5D2 than it is between the 5D2 and 5DC. Compared to the 5DC, the 5D2 was basically a slightly improved sensor in the same POS body with the same POS ergonomics, POS build quality, and POS AF system. Yeah, I wouldn't mind an extra stop or two of DR, but the 5D3 is such a huge improvement - as on overall package - over the 5D2 that I'm a happy camper. Its world-class AF system and very respectable burst rate combined with its low-light performance make it so much easier for me to make money with it
