Ritz Carlton does a champagne one as does the Repulse Bay..otherwise the intercon over on the other side... Many others do unlimited sparkling wine though.
The JW Marriott at pacific Place is starting a really nice upscale champagne brunch, starts Sunday December 11. It is free flowing Piper Heidsik Champagane. The brunch has lobster, cavier and many other upscale items.