I've climbed v6 in the gym and 11c sport routes outside. There are 5.6 granite pitches that absolutely kick my ass. The sandbagged grades are very real in the mountains, and the style of climbing is totally different from whatever you see in the gym (flaring offwidth cracks are my weakness, the only ''gym'' I saw that had anything like it was a shed owned by a guy who made first ascents in Li Ming).