Raven Osprey 3.1 vs Leben cs600

I have been using a Leben cs600 for many years with DeVore O93 speakers.  My brother who is quite a gifted musician ( mainly Trumpet but some woodwinds as well) recently acquired a Raven Osprey and cannot stop gushing about its tonality and sweetness.  I would love to hear it side by side with my Leben but unfortunately he lives 2000 miles away in Montana.  I wonder if anyone has had the chance to hear both of these integrated amplifiers?  If so I would be interested in your impressions.

Thanks.