Sonic's running speed in the comics is often portrayed as superhuman and hard to measure precisely. It's one of his defining traits and can change based on the plot and the author's imagination.
In the comics, Quicksilver's speed is off the charts. He can move so fast that it seems like time slows down for him. Different storylines might give slightly different estimates of his top speed, but it's always insanely fast.
In comics, the speed of the Flash varies depending on the storyline and the power levels given to him. Sometimes he's shown moving so fast that time seems to stand still for him.