Hi John - Yes, I have the 11137. Got it from Paul at Connaught. Fantastic brush that I use in rotation with a Semogue 1800 (the unpainted version of the 1305). Loft is about the same for both. Strangely, I don't prefer one to the other. They're both great looking brushes and superb bits of kit. I'd say the Omega has very slightly thicker hair, but they both have great backbone. Interestingly, neither has shed a single hair from new.
During the week I rotate them both, allowing each to dry for 48 hours before using again. Don't know if it helps prolong the life, but it's a good enough reason to use both and they're cheap as chips anyway! Friday and Saturday they're retired in favour of a Semogue 2015 HD silvertip. Luvverly. :mrgreen: Can't see me buying any more brushes until one of them falls to bits through years of use...
Hope that helps.
Baz