For me it's... An ultrazoom lens. Yes, yes, yes, right after release of 28-200 I am telling that I am missing al ultrazoom. Why? Because I am completely unhappy with 28-200. Ultrazooms are meant to be "All in one" lenses. So you can take one lens with you and it will cover at least 90% of what you will want to take pictures of. However, 28 is not wide enough, 200 is not long enough. So with this lens I will be limited from BOTH sides! That's why I am not happy with this release. It should be either 24 on the ide end or 300+ on the tele end to interest me, or both, which would surely make me happy.
So yes, I am still waiting for a good ultrazoom lens. But now I don't think I'll get one