Oh ok.
Well My friend wants to get a DSLR and we are trying to figure out what his needs are and which way to go. He has narrow it down to Nikon D7000 and Canon 60d. I don't know much about Nikon so I can't really recommend anything to him. We are just weekend shooters.
The Canon 7D, 60D and Nikon D7000 - with their very high pixel densities and very strong anti-aliasing filters - "require" very sharp glass. That doesn't necessarily mean pro-level lenses, though. The consumer-grade Tamron 17-50 f/2.8 (non-VC) handily beats out many "pro-level" Canon and Nikon zoom lenses in terms of sharpness, for example:
Tamron AF 17-50mm f/2.8 SP XR Di II LD Aspherical [IF] (Nikon) - Review / Test Report - Analysis
Build quality and autofocus speed- and accuracy is another matter, of course.
But anyway. Nikon's "professional-level" zooms. Just 4, really:
14-24 f/2.8
24-70 f/2.8
70-200 f/2.8 VR II
200-400 f/4 VR II
The 17-35 f/2.8 as well, but it's an outdated design. The 16-35 f/4 VR is much sharper - but is not built to pro standards, IMO.
Primes:
24 f/1.4
35 f/1.4
85 f/1.4
105mm f/2.8 Micro
105 f/2 DC
135 f/2 DC
200 f/2
300 f/2.8
400 f/2.8
500 f/4
600 f/4
I don't think the 50mm f/1.4 belongs in that list, but I'm sure some will disagree. This is just from memory, but those are the main ones. The outdated 14 f/2.8 and 200 f/4 micro are still in production, as far as I know.
Then *I think* there are a few DX lenses that are built to pro standards. The 17-55 f/2.8 and, I guess, the 12-24. Not sure, though.