Originally Posted by Kage
Four Third cameras use the same sized sensors as SLR's so whilst they don't have the mirror mechanisms, they are essentially the same quality.
I have been wondering about them myself, but something says 'professional' when you are holding an SLR in your hands
Four thirds is a true SLR format. I think you are thinking of micro four thirds, which is designed for cameras to bridge between high end point and shoot and low end SLR.
My camera is a regular four thirds SLR, and I must say that I am impressed, but it seems to me like twe sensor is still far too small. This is still a problem with all DSLRs imo. If you don't believe me, try to photograph something dark against the sky. The dark areas wil usually be exaggerated. The picture stil looks good, but it is not how things actually looked. I usually have to take three bracketed exposures and use photoshop to merge them in order to get it right. Idk, it just does not compare to film imo.