Occams_Cat said:
Funny, I've got both the F2.8 and F4 version of the 300mm and I can't see any difference in sharpness wide open. The bokeh is subjectively softer on the 2.8 but more than often I choose to carry the f4 version as it's images are so sharp and with the 5D3 and 1DX being so good in the higher ISO's, I'm happy to take the 1 stop hit.
Perhaps there's an issue with your copy of the 300/2.8L? Both the
MkI and
MkII are noticeably sharper than the 300/4L IS.
Occams_Cat said:
This new 100-400 has a lot to live up to. I have never encountered 1 copy of this lens over the last 10 years worth owning, they have all been soft at anything near the long end. Such a compromised lens. Hopefully, Canon can do something magical with this version.
My copy of the 100-400L was sharp at 400mm. Not quite as sharp as my 300/4L IS bare, but sharper than the 300/4L IS + 1.4x TC.