Don't know that I can talk you out of it. I have one and rather give up my 600mm II than the 300mm II. It is just a very versatile lens by itself and with both 1.4x and 2x extenders. If Canon comes out with a 7D II with 1Dx like AF, then it gets even more versatile.
Here are some samples:
300mm II + 2x III on 1Dx; f/8 ISO 1250:
300mm II + 2x III on 1Dx; f/8 ISO 1600:
300mm II on 5D III; f/2.8 ISO 100:
Let me know what you decide.
« Last Edit: October 19, 2013, 04:50:22 PM by jasonsim »
Cams: Canon 1Dx, 6D, EOS M
Zooms: 17-40mm f/4L, 24-70mm f/2.8L II, 70-200mm f/2.8L II; Primes: Sigma 35mm f/1.4, 40mm f/2.8 STM, 50mm f/1.2L, 85mm f/1.2L II, 100mm f/2.8L, 135mm f/2L, 300mm f/2.8L IS II, 600mm f/4L II
Support: Gitzo GT4542LS/GT2830/G2258, RRS BH-55, Wimberley WH-200