Alan Wilder , Sep 08, 2011; 04:19 a.m.
The improvement in optical performance is practically nil from the 35-70 range as both are excellent by any standard. The lens has obvious benefits if you need the extra 7 mm on the wide end, faster AF and a non-rotating front thread. The drawback is the significantly larger size and of course the cost. If you need the wider end, the 24-70/2.8 is a far better choice as the size is not significantly different than the 28-70 and optically it's one of the very best lenses in Nikon's arsenal equaling or exceeding performance to primes. Also of course, 24 mm is a bit more useful for wide angle fans than 28 mm. I personally own the 35-70/2.8D and suppliment it with a 24/2.8 AIS when I need the wider coverage.