Thank you, Bart. I think that in the final analysis, equipment is a tool
for a photographer and optical performance is only a part of its function. Some lenses have character as well. I always know when I really like a lens when I find myself watching TV and playing with a camera/lens at the same time, idly focusing on the TV, framing up on the fireplace.
If I try to analyse character, I can't and anyway it is a personal thing. It's interesting to note that, personal as it is, there is often agreement on it. This 17mm has character in spades as does its 45mm brother. The 12-35mm f2.8 Panasonic has none of the attributes that I'd have said give a lens character...but it does have it. Actually, I'm going to give this some thought and see if I can't do a blog piece on it.