Originally posted by Big G I guess the question is: what is your current setup not giving you?
This is definitely the best question to ask yourself if you are considering another brand, especially to run along side with a Pentax setup.
For me it was something that would tag along everywhere I go, and M4/3 fit that bill nicely. I am thinking about selling my K-x at this point, although it is an astounding little performer. The low light ability is great, but I don't use it too often, FPS is also fast but not something I use and video I now have a GF1 which has AF during filming, and I can still attach all my older manual lenses to the GF1 as well.
My first day on vacation last month we were at the beach and I had decided to leave my k20d at home this time...all of a sudden I have to worry about sand and the elements! I don't want to give that up, and the K20 ergonomics are still bar-none my favorite when it comes to usability and control access. I guess I have convinced myself!
M4/3 is a great compliment to a larger system, with the pancake my gf1 fits in a jacket pocket, or easily in a small bag, and the lenses are fairly compact as well. But, they are not f2.8! no high FPS, so the best thing to ask is definitely what doesn't my camera do for me that I would like to have?