Sounds nice, and pretty fat considering it's a 1x12. I really like the Celestion gold with my '64 Deluxe, but have yet to try it with the Express. Still you might break out the old G12M 4x12 next time!
My feeling is the compression folks are hearing is partially because the bright switch was OFF. The amp will be a bit mushier sounding that way, and not quite have the clarity and definition of having it ON. It helps give the illusion (perhaps) of less compression. However with it ON the trick is to find the right speakers to balance it out, right pickups, right cords, and tone setting on the guitar even... Plus you have to get low enough gain tubes so that you can get the volume up pretty far, so that the bright switch signal isn't leaned on quite as heavily. On the Express and most amps the bright switch is simply a bypass on the volume, so the further you push the gain the less bright it is so with these you have to get it up there and deal with the gain. Still your clip sounds quite brighter than I would think my original would ever sound IF I didn't use the bright switch. Mine is downright muddy with it off. Still I have yet to compare a JM built wreck with an original KF built one, so maybe I'm in left field on this theory. Oooops, I'm assuming this is a JM built "new" wreck?
Also hearing a distorted amp, just about any distorted amp will sound a bit odd recorded so close and mixed totally dry of effects. Not that you want to pile on the reverb, but just a tad of small room type reverb may actually sound more like it does in the room. Another angle would be a distance mic mixed in for some natural ambience.
One good tip with ribbon mics is to lean them in slightly, as the sound pressure then doesn't fatique the ribbon as easily as it's partially deflected instead of hitting it flat on. Learned that trick from Michael Wagener, who loves the Royers VERY close to the speakers even on blazing 100 watters. He's got some 4x12s with no grills, so he can get even closer than would be physically possible with a typical grilled cab!
That said, here is a recording that was the first time I've used a ribbon mic on my Express. Royer ribbon, mixed about 50/50 with a Sennheiser dynamic both right at the grill with G12M 4x12. Volume and treble 1, others on 1/2, full bright ON.
http://www.youtube.com/watch?v=A-yEuKTLlr0