The 40 Nokton was the first lens I bought, the main reason being that it is small, fast, and from what I had seen of it from Sockeyed's photos on flickr with it, I thought it was a good place to start. I can tell you the layout is the same as the PII, with the aperture dial being slightly farther away, and the focus ring is a little thicker, good enough that I can use it to focus without using the tab. The tab is also a little bit larger, I find a bit more secure than what I have with the PII. I'm lucky in that I'm not really hurt for speed while Raid has it (the MC one), I managed a while back to get a nice CLA'd Summarit. For the price and quality you can't go wrong.