Looks like the combo was back focusing a bit, after a bit of MA (-4) looks like the 2x III is really showing its colours. As always Flickr does not really do PQ justice.
The lens does look a little soft at f5.6 but razor sharp at f7.1
f5.6 @ 140mm
http://farm6.static.flickr.com/5122/...cc397511_b.jpg
f5.6 @400mm
http://farm6.static.flickr.com/5167/...48d409e0_b.jpg
f7.1 @140mm
http://farm6.static.flickr.com/5202/...a5a3b96b_b.jpg
f7.1 @400mm
http://farm6.static.flickr.com/5289/...ff61ae5c_b.jpg
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http://photography-on-the.net/forum/showthread.php?t=838247&page=138