I'd get an EF 85mm f/1.8 and a 135mm f/2L over the 70-200mm f/2.8L. Image quality is one reason, larger maximum aperture is a second, weight and size are two more.
The 24-70mm f/2.8L II is an exceedingly high quality lens I would not discount it just because it lacks IS.
The 70-200mm f/2.8L IS II is no performance slouch either but is really big and really heavy. if you discount size and weight as a factor try renting one for a week, carrying it around and working with it daily and you'll see what I mean.
Which ever lens or lenses you end up with, do yourself and your clients a favor and get either the LensAlign Mark II (http://michaeltapesdesign.com/lensalign.html
) and FocusTune software (http://michaeltapesdesign.com/focustune.html
combination or the Datacolor Spyder LENSCAL target (http://spyder.datacolor.com/portfolio-view/lenscal/
) and tune the performance of your camera's autofocus system for your individual lenses.