FEChariot wrote in post #17112615
You would have to show me from a site like TDP where Bryan has the ISO crop comparison or a similar site but I don't think there has ever been a 2 stop improvement in ISO performance from a direct replacement model. And it certainly has not been from crop bodies. The gains in FF bodies have made the largest of gain from direct replacements.
And I am not talking about just what is available at the top. The top 3200 on a 5Dc is much cleaner than the top end of 25K on a 5D2. It's actually cleaner than 12k.
Note that "stops of improvement" are a relative measure. So it's applicable to different sensor sizes. So nothing stopping it from happening in a P&S or a APS-C or medium-format camera.
But big improvements tends to happen from the high-end first, because these buyers are spending more time reading the datasheets or comparing IQ between different gear, even if a significant part of the bulk income comes from lower-end gear because of the much larger volume.
So - a drastically improved sensor would be more likely to happen in a 5D3 or 1Dx replacement than in a 70D replacement. But the 7D really is a body that has been waiting a long time for a replacement and it is the highest-end APS-C body Canon has. Not only that - given the volume of sold 7D bodies, it has been an extremely important product. In short - I don't think Canon would see any reason to hold back on what sensor improvements they may put in a 7D replacement. I'm pretty sure they would add the best they can add, and later worry about what release dates they could have for follow-up full-frame upgrades.