Even though, I don't understand the versioning of software sometimes, but Opera has 11 version, Google chrome is 13 version, when I remember I used to use Opera 9 and 10 not so long ago, Google chrome 7 also not so long ago and I don't feel anything to much, the style usually changes a bit, but I guess browsers nowadays are just being optimized to be faster and that's really good, better algorithms! Better performance!
Every half year firefox says, it's 20% faster, it's 30% faster! Try to download Firefox 2 and browse, so will it be over 9000 faster? I doubt it
Also, it seems that Google chrome updates itself not even notifying about it you, firefox seems to moved this by default too, Opera also usually wants to updated next time without notice, but I always remove the check-box to do that






