I installed a factory fresh pair of LS5/8 in our living room yesterday and was gob smacked by their performance. All of the wonderful qualities of the LS5/9 are there: midrange magic, timbral accuracy, three dimensional soundstage. But the bigger brother plays so much bigger, it almost makes its sibling sound polite.
Currently driving the LS5/8 with a pair of Luxman B-1000f Anniversary monoblocks. The living room is approx. 1,200 sq ft on the ground floor and 1,800 sq ft on the second floor, so those 12" woofers are moving a lot of air. I am amazed that a $12,500 pair of speakers could fill our living room and do so with utter grace. Hats off to Derek Hughes & the Graham Audio team. Video links to follow.
Magnetically attached grills
True to its professional roots, the HF can be adjusted =/- up to 2dB, very handy in an overly bright or dead sounding room.