It will not take advantage of the megapixels on the sensor, so if you mean "well" or "bad" in that way... then it isn't a great pairing. But it will work just as well as on any other full frame or DX camera.
What you need is a 70-200, even the cheapest non-IS F/4 from Canon would work great, and HOLY **** better then the Tamron you mention.
The Tamron would be like putting low end all-season cheap tires on a race car.
It'll still go fast but..
How'd you even end up with a 5DSR?
Something tells me you could have gotten a "better" camera for your needs for less money.
Thank you for the advise DB Cro, I like this idea better, I'm looking at this other lens "Canon EF 70-200mm f/4L USM Lens". I will use it to shoot from a helicopter and action images (non sport). Comments?
Right now I'm using Nikon with similar characteristics.