That demo sounds very nice to be sure, but to my ears the demos for 8Dio's Adagio Cellos sound more real and impressive, especially "Giulia" and "Abandon".http://8dio.com/?btp_product=adagio-cellos-vol-1
"Brendon Dusk" relies on special articulations (trills) a lot and those have a tendency to sound really dazzling, but when I listen to the actual bread and butter legato lines in the demo, I don't find them as convincing or expressive as the best 8Dio demos (which btw use Cellos and Violins only since the rest of the section hasn't been released yet). The really high violin lines also don't sound as real to me as LASS...
So I would say no to "best ever" but it is definitely a worthy contender and another great option.
I do not know the exact recording specs for other libraries but I know they all use high quality gear...I've found that there are a lot of factors that contribute far more to the realism of a string mock-up than recording chain one-upmanship...(no offense to Spitfire who obviously make impressive products).