I must say that when it comes time for me to mount a scope on a hard kicking rifle, I look to Leupolds first because they are the industry leader in eye relief.
That said, I have a 7mm Ultra Mag that wears an Elite 4200 4x-16x-50mm The eye relief is about a constant 3.6" if memory serves me correct. The scope does come awfully close to hitting me when that I shoot that dang gun. I do get sub MOA groups with it, but I would feel more comfortable having a bit more eye relief.
Also, I have an Elite 3200 1.5x-4.5x-something mm with the Firefly reticle. This little scope in mounted on a .375H&H mag! The eye relief on this scope is about 3.6." The scope has never hit me, but I would still feel more comfortable with longer eye relief.
As for Zeiss Conquests scopes, I hold them in a very high regard. I like them better than the older Vari-X IIIs, and about the same as the newer VX-IIIs. My favorite model is the 3x-9x-40mm because it has a constant 4" of eye relief. The other models have about 3.5" of eye relief. As such, I would opt for a lesser priced (but not lesser quality) Elite 4200s.
Another good thing about Leupolds is that they are generally lighter and shorter than most scopes in their magnification range. The bad thing is that, if you really don't need these characteristics, you are paying quite a bit of money more than the average scope. The bad thing about the Elite 4200s is that they seem to be longer and heavier. Then again, with about the same super high quality optics, the Elite 4200s are noticeably less expensive than the Leupold VX-IIIs.
Zachary