There is a lot of guessing, making of claims and general pontificating going on here. If one wants to compare the R11 to the Reference 5 put them both on a Klippel and look at the measurements first. Then, do a double blind comparison. At, $20 large, I find myself very skeptical of the notion the Ref 5 is any more than marginally better than the R11 for $6k. The few existing published reviews (measurements included) tend to support my view. At $200k the Muon isn't even on the same page.
I agree with you, FWIW here are the Kef R-series measurements I know of(other than Erin/Amir's):
Kef Reference 1, 3, R11, Blade 2 from Soundstage.
Kef Reference 5 from Stereophile.
You have to take all this with a grain of salt because these measurements(especially stereophile) aren't as comprehensive as the Klippel, but to my eye the R11 looks very similar to the Reference 3/Reference 5 to the point where it's too hard to call with no DI curve or Klippel contour map.
The Blade 2 looks like it has worse directivity issues than the others.