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I have been using the 24/2.8 AF on film for 20 years and its a good lens, but on my D7000 its disapointing, needs stopping down to 6.3 or 8 to get reasonably sharp in the corners. According to Photozone its probably to do with pixel density so would presumably be even worse on the 24mp DX cameras. I did some quick tests against my friends zooms, and both the 18-55 and 18-135 kit lenses were better at the edges at 24mm and the wider apertures. A great disapointment as I had hoped to use it as a compact 35mm equivalent
I went for the Tamron 17-50/2.8, the non VC version which is smaller, cheaper and supposedly sharper. I am happy with the performance although regret the bulk. I do wish Nikon or someone else would give us some good DX wideangle primes.
The question of the 28s is a bit more complicated, the original 28/2.8 AF was supposedly the old E lens and not good, but when they went to AFD it was redesigned I think and is reputedly better, I have no experience, I don't use 28mm much and the only one I have for Nikon is an ancient Tamron AiS mount which is OK stopped down.