The digic V has been around for almost a year I think and the 61 point auto focus system used in the M3 was introduced 6 months ago on the 1Dx. I doubt this has been a rushed camera. The build quality is tremendous and everything has been improved from the M2. There is not 1 feature that has not been improved upon on the M3. Unlike the D800 which while offering awesome resolution and DR is much slower and did not heavily improve high ISO performance (though the performance is stunning for a 36MP camera). If you want to compare something with the mark IV, compare the 1DX which has a separate processor JUST to run the AF system. I'm sure the AF on that camera will be unquestionably instant. The 5D mark 3 is using the 1 Digic 5 to power 22mp @6fps plus the AF & metering. That is A LOT and still it manages to perform well with a monstrous AF system, tons of pixels, and lightning quick 6fps shooting. For anyone coming from the lame 9pt Mark II focus system with 1 cross type sensor, the Mark III is out of this world. The Mark II was praised for its image quality more than any other comparable camera and I think that is why Canon focused on other areas more than resolution and dynamic range. But seriously, what would Canon have changed if they had an extra 6 months? The Digiv V was already developed and the AF is already top of the line. Most people (especially Nikon shooters) criticized the 5D mII for its high MP count.