if you've got all the glass you need, then you're all set. but you're looking at buying a new body, and the only advantage i can see that you'll get is better ISO performance. Most of your glass is moderate speed, and with some fast primes (and you only need two), then you'll get two stops better with your existing camera.ummm sorry but what "glass" should i need, apart from some very expensive primes, i have most of what i need