Correct. There are some downsides to that lens - focus is not as fast, especially on Olympus bodies - and it hunts a bit in low light. I still own both these lens and like them both, but I find out that I am using the P20 more (at least on my copies, the P20 is amazingly sharp, way more than it should be for such a tiny lens).
Whichever way you go - share your photos with us on one of the cars / trucks threads.I think I'm leaning toward sticking with Olympus lenses on the theory they will likely work best on the Olympus body. I'm debating between wide and fast. I'd like to have wide for local Friday night car shows in Lowe's parking lot. There are times when you barely have more room than the space you are standing in to get a shot, so wide would really help. That has me debating 12f2 or 9-18. But 17f1.8 gives me fast like the 12 at a lot lower cost.