I have just one lens for my K-01. The DA 40mm f2.8 xs kit lens it came with. I use it to shoot my paintings and sculptures in my studio. I have proper lighting, and a tripod. If the painting is big, I move back. There were times I almost couldn't move back far enough, so I tried some slightly wider legacy lenses, but sold them already. Got a bigger studio instead
When I want wide angle shots of an art gallery installation, or macro shots, I use a compact Panasonic LX3 24-60mm, sometimes with a 18.5mm equiv. Panasonic converter which is pretty sharp across. and it suffices well enough for overall views.
So far the two camera set up works well.
No plans to print bigger than 8.5 x 11in. for catalogs.
If I had more play money, I'd get the 15 Ltd, and the d-fa 100mm 2.8 Macro.
Often I wonder if the 35 Ltd(or 35 2.8) would be noticeably better than the 40xs?
I'm happy with the 40xs for now.
So, 6BQ5, yes(for now), I use just one, the 40xs. I don't know all it's strengths and weaknesses, just that it works very well!