In reply to Robert Durran:
Robert, Adam doesn't systematically onsight every route up to 8c+. This is the interview where it does admit that the whole onsight at high level is completely route-dependent
http://www.planetmountain.com/english/News/shownews1.lasso?l=2&keyid=40...
this year he could not onsight routes as "low" as 8a, for example.
His 8a.nu scorecard is a very (if not totally) transparent and complete record of what he's done since the beginnings. Going through it really shows what he has achieved and it's no surprise that even top climbers like Dani Andrada and Ethan Pringle totally look up to Adam they way most of us could look up to them.
By now Adam has onsighted 14 routes he logged as 8c+, 3 of them are on granite, 2 on sandstone, the other ones on limestone (6 of which in Spain).
Not sure about all the comments about perfect sequences without a comparison (Pringle's video maybe?). He just finds sequences that are good enough to keep going and, as somebody said before, minimise the faffing.
A good enough decision in a short time is better than a perfect decision in a longer time.