Can we assume you heard the B&Ws and SFs in the same system and acoustic environment as your JBLs?
As for the R909, here are my assessment of the smaller R907: http://www.stereophile.com/floorloudspeakers/jamo_reference_r_907_loudspeaker/
As for the R909, here are my assessment of the smaller R907: http://www.stereophile.com/floorloudspeakers/jamo_reference_r_907_loudspeaker/