Hi vargus -
The answer to your #2 is certainly YES, the WP7 have a very differnet presentation than the Sophias. Which is better? up to you of course - Most seem to prefer the WP7, I personally prefer the Sophias. Yes, I have compared them in the same room, with the same system. There were no bottlenecks. I would not recommend buying a pair of WP7s based on your audition of the Sophias. You very well may like the WP better, but it would be a shame to buy them and find that you don't like their presentation.
The answer to your #2 is certainly YES, the WP7 have a very differnet presentation than the Sophias. Which is better? up to you of course - Most seem to prefer the WP7, I personally prefer the Sophias. Yes, I have compared them in the same room, with the same system. There were no bottlenecks. I would not recommend buying a pair of WP7s based on your audition of the Sophias. You very well may like the WP better, but it would be a shame to buy them and find that you don't like their presentation.