I'm a very happy user of the Lumix GF-1, but I've never really loved Panasonic's 45-200 lens. Always a little too muted, alas. (I usually stick to the 20mm Lumix pancake.) So, now I'm thinking I'd be happier with either this Olympus 14-150 or the (more expensive) Panasonic 14-140. Any thoughts on which is "better"? That is, crisper, faster, sharper, more vibrant, etc.?