Sounds just like you were comparing a Mercedes SLK to an SL!
The SLK will surely please you, it's a great convertible ,but the SL's overall performance is something else, so is the price, and maybe it won't fit into your garage !
I've owned sequels for about 8 years, I really love them.Before buying, I listened to both Sequels and Quests (the reQuests weren't born yet!), and there was,of course, a huge difference in terms of precision, definition, realism (specially with voices), spacing...
But as TomDac said, the reQuests need a lot of space and will probably sound boomy in a small room because of bass extension, far superior to the Sequel's.