The protection is not all that bad. It's comparable to Apoplexy (photo above). The first two placements are the same as Apoplexy, the next one is a shaky sideways stopper that might be useless, and the one above that is what I thought (hoped?) was a pretty good C3 placement. There is a long runout above that cam, but the moves get easier the higher you go.
That's not to say it wouldn't be scary to onsight it (I didn't dare), but it is leadable.
By Jon Clark From: Philadelphia, PA Aug 9, 2010 rating: 5.106b20VII-19E2 5b R
^^^^^ Well, I did lead it onsight. The first two placements are not on Apoplexy. They are in the same horizontal, but directly below the super thin crack. The protection through the crux is poor to non-existent. I got a #1 or #2 BD micro nut in before the sequence, but it wouldn't be worth much more than a hang. If you blew it going through the crux you would most likely deck from 25+ feet.
I tr'd this after leading apoplexy, couldn't imagine leading it untill the top sections after the face climbing. crux was definitely low and the near the top is amazing, if there was more placements for pro it would definitely be a classic.
A favorite variation of mine is to start on Apoplexy, do the scary flake, then angle rightwards to hit Coronary above its crux. The upper corners of Coronary are terrific to lead, in the 5.7 or 8 range I think. And it's a straight shot to the bolts this way.
Apoplexy is a well protected climb. Coronary is NOT. It is however a great climb to TR after leading Apoplexy. Great thin crimpy face climbing to some easier corner climbing above. I like that chunky conglomerate rock near the top. No way would I lead this.