I found the Catalyst skates to be the same sizing as the TF series except that there is a thicker foam piece in the front of the toe.
I was lucky able to bake both a size 6.5 and a size 6 and, as stated by everyone else, baking really changed how the skate felt from pre-bake.
Pre-bake, the size 6 felt way too short and and the 6.5 was the right size but post bake, my feet settle in towards back more and it was too large and wide.
The skates, open up a lot when baked but i did notice that there is a large front pad that affects the perception of sizing.
For reference, I'm a size 6 fit 2 in the Hyperlites and a size 6.5 fit 2 in Ultrasonics. Mach skates I only got to try on a size 6.5 fit 2 and those seemed to be perfect with a wider toe cap than the Ultrasonics.
Didn't get to try on a size 6 to see if the wider toe cap allowed me to fit smaller but the 6.5 had my toes barely brushing the toe cap pre-bake.