Not really, optical zoom on the phone cam isn't like amplifying a 64kb audio. Digital zoom totally sucks, let's face the fact. What it does is it crops the picture and enlarge it. The picture looks ugly, even if you aren't viewing it at its full size yet. The enlarging in the phone isn't as good as Photoshop too. This is why 20x digital zoom doesn't sound more promising that x5 digital zoom at all, IMO. Optical zoom would make the picture quality when zoomed in without the digital enlarging. That is quite a lot of difference, even to the photos the N73 and N93 make, which I think are pretty decent. (Sure, the purple photos suck, but the resolution is not bad at all)
For example, the resolution of x3 digital zoomed 3mp picture is no different to a 1mp picture... Now imagine x3 optical zoom. -_-" That's a lot of difference, N80 (though I'd say N80's cam is not what you'd call a 3MP) to 7610, to be precise...