Irina's coverage was good, but it's not like she held the position across the ice. I'm more impressed when the position is sustained as it moves across the ice without having to drop the position, stroke a few times and then do the position again...
I agree with the majority:
Kwan reigns supreme in the spiral. The power she had with that move is amazing! The strength of the edge, how effortlessly she's able to go from a deep inside edge to an outside edge, the steadiness of the free leg (no wobbling), the extension and back position, the speed, the ice coverage and the way she used it in her programs...simply incredible. It is her signature move and is really
the iconic move in figure skating.
Sasha's was wonderful as well. The
180 degree split and toe point was gorgeous; however, she never really got the hang of the COE spiral--she often had to put her foot down to change her edge or would wobble quite a bit. She usually executed the move on the flat of the blade but it was still lovely. In terms of other spirals, Sasha's
fan spiral to skid move is a favorite of mine.
Mao has a number of lovely spirals. I think she has one of the
best fan spirals in the world: the extension is gorgeous and the lean on the edge is amazing. Her classic position is lovely, though she tends to drop her back a little too much at times.
Mirai's spiral has lovely lines and wonderful extension, though it's not as fast or powerful.
Yu-Na has great speed and coverage on her spiral but her position (turnout and hip position) is pretty mediocre...
Caroline Zhang had very lovely spiral positions (classic, catchfoot, Charlotte). Her speed and depth of edge wasn't all that great, but she had
good control in her COE. Plus that
backwards extension move was awesome!
Sarah Hughes had a nice spiral in terms of extension. Emily Hughes had good extension but I never liked her spiral b/c her forehead was six inches from the ice.

Okay, I'm exaggerating but
she dropped her back way too far down...