I contemplated getting the 16-50, but plumped for the 15, and then I'd hope to augment it with my 15, 35 and 50, to cover the range the zoom would cover anyway. I can limit myself for a challenge when I want to, I can carry less and shoot faster and wider if needs be. Sure I need to change lenses every now and then, but unless I'm on a job, I have the time to do that. And on a job I just take my K-x along with me.
But as everyone here says, the 16-50 is a great lens and you wouldn't go wrong with either, just know that the 15mm would need supplementing with a few other lenses, but it's a beautiful lens and it's a joy to use.
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