Inna - From what I've read, the 40.2 is more efficient and has tighter bass vs. it's predecessor. The 40.1 is known to have issues with a bass hump. Personally, I've owned the 40.1's for approx. 5 years and I like the bass as it is.
I agree with Snackeyp with his characterization of the Harbeth M-40.1 sound.
If I were to compare the SF Olympia III and Harbeth M-40.1's to cars, I'd say the SF is more of an exciting performance car, whereas the 40.1's are a comfortable, relaxing cruiser that smooths over the bumps in the road. I only heard the SF Olympia III's briefly at a fellow audiophiles home. I thought they sounded very good. A lot of detail, fast and slightly dry/crisp. Definitely a well crafted speaker and beautiful to look at, but I think I could tire of the detail and crispness of the highs.