Don't know if there is noise @ ISO 100 on the 60D. But I'd have to agree that the 6D ISO performance is outstanding compared to the 60D. I recently rented one for 2 weeks and didn't want to send it back. I was hoping the 70D would draw somewhat closer to the 6D in higher ISO images but it seems like that's not the case. I'm torn on upgrading to the 6D or hanging on until the 7DMkII. I'm starting to wonder if Canon limits high ISO abilities in the crop sensors to more or less direct people toward FF sensors.
If I had to *guess* - and that's all I really can do - I would think that the 7D2 will have better high ISO performance than the 70D. While Canon could do otherwise, I am thinking it will have high ISO performance close to if not similar to the 5D3 with more FPS shooting and better weather sealing. I doubt high ISO performance will be quite as good as the 6D but only because they want to differentiate their lines some.
This is how I see it. Again, it's just my guess:
- 1D X and beyond - for those that need or want the best, and those who need to shoot in a monsoon.
- 5D3 and beyond - for those that need an excellent all around FF camera for speed, AF, etc.
- 6D and beyond - for those that need extreme high ISO/low light performance and are willing to sacrifice a bit on AF. Also for the budget conscious who want to "step up" to FF.
- 7D and beyond - top of the line APS-C camera for those who want a well sealed tank of a camera with fast AF, high FPS, and may already have an investment in EF-S lenses.