I've got a box of 3366s in size 6. They are definitely not a 2xl (or even 1xl) hook. I compared a #6 3366 to a #6 94840 and they are approximately the same shank length. In fact, the straight part of the 3366 shank is slightly shorter due to the sproat bend. The 3366 is also a straight eye hook (not turned down eye) which may or may not be what you want.

I don't have a lot of experience with the 3366. I originally bought the box of #6 3366 for Clouser Minnows and have used them for Clouser and some other flies, but not for any of my regular, high use trout flies.