Any suggestions/comments?
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I did test drive the Tokina 50-135/2.8 on the 400D. Wide open performance was exceptional, excellent sharpness and color rendition. The bokeh was very smooth, and oof highlights rendered beautyful.
Putting the price in perspective, build quality is awesome. The lens just breathes endurance, though at quite a weight (~850g) related to its rather small size.
On the con side, the autofocus on my copy was rather unreliable. Approx. 25% misses on mostly static subjects (head & shoulder portrait at al) using the center / cross-type AF-point. The focussing speed is ok, and as the manual gears get decoupled when on AF the MF ring does not rotate.
As usual for Tokina designs, CA can be quite pronounced on high contrast edges.
In the end I did send back the Tokina, though when I today scan through the images taken back then, I am quite tempted to give another copy a try.
A contender in the same focal range is the Sigma 50-150/2.8, which uses HSM (~USM) focussing. It currently exists in its MkII generation, while MkI specimen are still around on sale. The MkII is supposed to give relief to some focus problems the MkI version displayed at near to minimum focus distances. Word has it that there are still some problems in that area. When used like 30%+ farther, the AF is told to be quite reliable. IQ, given the various test results, is quite exceptional. My guess is that the MkI version might be quite a bargain.
Regards,
Ray
EDIT/PS
Reading your text again, I saw you were referring to a 5D. Those two lenses are designed for APS-C and won't work on full frame or at least vignette heavily.
To mimic the same FOV on full frame, there are quite a few options in the 70-200 range, e.g. the Sigma 70-200/2.8 HSM which is very well regarded.