4g speed UK

My contracts up so I'm due an upgrade and I'm waiting for the 920. (My mate who just ordered the new iPhone laughed when I said I'm waiting for the new Nokia!). I'm on Orange and can switch to EE & keep my 40% friends & family discount.

I committed anyway but can anyone explain if there is a latency boost reduction with 4G?

I only browse casually on my phone, not may big downloads, so I don't really care that it's X times faster (meaning 5 times more bandwidth or whatever)