I'm a very new DSLR user, just bought a K-50 three days ago. While it came with 2 new lenses, mostly I've been out using my old M series lenses that I bought back in the 80s for my ME. It's been fun and I've really enjoyed looking through the pictures on this forum.
This is my modest collection of M lenses. The 50mm came with the ME camera and I purchased all the others new "back in the day". Having these old lenses was one of the main reasons I chose a Pentax DSLR.
Here are a few other shots:
28mm/f2.8
50mm/f1.7
135mm/f3.5
200mm/f4
135mm/f3.5
I have a lot to learn and there is a lot to keep track of but overall I'm pleased with how easy it is to use the old lenses.