So having read the forum for a couple of years, finally have a question that needs your experienced opinions.
I had a 7D, and used it with my 500mm f/4.0 IS for shooting small birds (and big ones if they came along).
The combination was great, but I was never really happy with the IQ of the 7D.
However, with my other photography such as street and equine, I always felt that the images from the 7D were lacking a natural look, especially as I was cropping to 100-150%.
So I bought a 5DmkII, and I was blown away by the IQ, I loved it.
By the time the 5dMkIII had been out for a year, I'd stopped using the 7D, and had also swung towards the equine photography.
So, I now only have a 5D mkIII which I use 90% of the time with a 70-20mm 2.8 mkII, and a 500mm sat in the corner.
I have a 2x mkIII which I bought instead of the 100-400 to use with the 70-200, and it's awesome.
Should I exchange my 500mm for the 300mm 2.8 mkII, would the 300mm with the 2x mkIII give my IQ that near to the 500mm f/4? Considering it would be just for occasional use.
Such a hard decision, especially as I no longer have the crop factor of the 7D. If only the 7D mkII would appear with an 18Mp 1.3x crop sensor...... (similar to the 1D mkIV)