Well, kind of.
But it's a real interesting article on the MLS Rumors site, linking MLS teams compare to top clubs in England.
Here's the take on the Sounders:
Seattle Sounders = Chelsea FC : When you watch an EPL match at Stamford Bridge, you see one of the most cleanest and well kept football grounds in all of England surrounded by a roar of supporters. The Sounders are truly the Chelsea of MLS. Chelsea can be in someway treated as an expansion team because they broke out in 2004 under Mourinho just as Seattle did under Sigi. Over 30K a match with support that cannot be described in words. Seattle and Chelsea not only are one of the big dogs in their leagues, but have a heck of a team as well.