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Well - that's one of the specs that Canon uses to differentiate the camera groups.

+1 also for the tripod as well. Or, crank up your ISO.

the only thing the 2 lenses share in common are the 85mm focal length, otherwise they are completely different in both stature, and application. if you do not use your 70-200 f/4 much, but love the focal length of 85mm, but wish it had more low light capability, the 85mm 1.8 would be more suitable. but if you are shooting sports in daylight, its hard to find a better zoom than the 70-200, it all depends on what you want to use it for.

How much is real and how much is crippling the xxxD so that the xxD and xD is better I don't know but it does slow it down a lot, that's no lie.

"i think that they are same" Both get really good reviews. One is $360, the other is $500. If they're really that close in quality, I'd get the Canon. This is one of those rare instances in which the Canon is less expensive than the third-party.

I kind of like dulgee's suggestion.

I'm pretty sure the OP could use a 800mm 5.6L IS USM for portrait for instance or for landscape...

You still have 'full control' in AV or TV. I've never understood this argument - it's just a different way of operating. I can use EV, spot metering and exposure lock to do my 'manual' settings in AV or TV... The main benefit of manual is that it will give you consistency across a series of shots and allows you to bypass the camera's metering in situations where it becomes seriously challenged.

+1

well autofocus DOES work on the XSI in liveview mode... back button focus, you can enable or disable or choose what kind you want in the menues...