DTS has got them all beat. Just came out with DTS ES Discrete 6.1. Plus they have DTS ES Matrix 6.1 and DTS Neo:6 (which acts similarly to Logic 7, Circle Surround, and Fosgate's 6-Axis).
The Denon 5800 will be the first receiver to offer these formats to consumers. Outlaw Audio is working on their own audiophile pre-amp for under $1,000 which is supposed to include these newest DTS formats and should arrive the latter part of this year.
The best part is that your current DTS chips will accept DTS ES Discrete 6.1 and play it as 5.1 (the seventh channel is embedded as a type of metadata) and any DTS Digital Out capable DVD player will pass this bitstream.
The Haunting DTS SE (with a new 24 bit, improved 7 channel remix from Lucasfilm encoded at 24 bits exclusive to this DTS release and reduced price!) and a new DTS CD, Don Henley's The End of Innocence, are the first titles to be released with discrete 6.1 tracks.
The first review of DTS 6.1 with The Haunting DVD compared it with the original 7 channel master first created at Lucasfilm's Skywalker Ranch and said that with the proper DTS ES equipment (symbolized with a new "DTS ES Digital Surround" logo to indicate compatibility with ES 6.1) at home, you would now get a definitive version of these 7 channel discrete masters (and it even improved upon it because of the new remix tweaking done). The extremely tight (not boomy like the previous DD EX release) bass comes out at 20-25 Hz in ALL seven channels when tracking the movement of the phantoms around the room precisely, so full range speakers at all 6 (or 7) main vectors and an LFE sub would be a must.
Chicken Run, Gladiator, and possibly even the Star Wars saga are likely candidates for DTS ES Discrete 6.1 tracks, plus more 6.1 DTS CDs are on the way. Can't wait!! =)