I'd be curious about this comparison.
If i were to get any LFR, it would be the 660s to replace our M60s.

Still trying to decide if i may ever replace the big Tannoy D700s in the living room or not. Going to start with getting a more powerful amp. The Anthem running them was always intended to drive media room speakers and it runs out of high end juice when i crank up the Tannoys. They don't play clean and it gets ugly.

"Those who preach the myths of audio are ignorant of truth."