That won't be much of an upgrade over the 5D2, Save alittle more for a 5D3.
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If it can out-resolve the 7D, It should Out-resolve the 46Mp camera.This is not a fair test. All lenses have better resolution in the center area of the image. APS-C (7D etc) usese this area only. In FF the full field is being used, and the resolution for off enter area will drop. Some might even drop drastically.
The 135L is one of those lenses.
TDP just put their ISO 12233 images up. Looks like the Tamron (at least their copy) is inferior to the Canon Mark II where it counts at 200mm & f/2.8:
Bummer, I was hoping to get 200mm at 2.8 with IS/VC at a bargain. If I needed 200mm at f/2.8 for mission-critical stuff and had the moneyI'd probably have to go for the Canon despite its insanely high price. I think I'll just get the superb Canon 70-200/4L IS used on eBay for $700 or so...