Hi! Thank You for your reply!
Ok, leaving away the Four Aces just for a while, could you help me to better understand what I saw this afternoon at the shop about these peculiarities? Thank you in advance!!!!!!
MK Professional blade has got the smaller Toe Rake dimension respect to other two blades. It is slightly shorter than the JW Coronation Ace one and shorter enough than the JW Four Aces one.
Sincerely, I don't know the meaning of having a shorter or longer Toe Rake dimension ... are you more skilled than me?!
MK Professional and JW Coronation Ace have got a cross-cut pick. JW Four Aces has got a straight Pick.
I suppose that a cross-cut pick should help you in the toe-jumps, even if the shop assistant told that, practically, there is no difference.
FIRST UPPER TOOTH
MK Professional has got the most prominent tooth and has got an evident curve profile (like a bump) between the first Tooth and the point of attack to the Toe Plate. On the contrary, both JW blades have got a smoother profile (it is almost linear, not so bumped) and a less prominent First Tooth.
I think this is one of the main (and important?) feature/peculiarity of the blades but I don't know what it means. I suppose it is useful in the toe-jumps, but I'm not skilled enough to understand what is better or what is more useful for one person and for another one. Please, help me!
DRAG PICK (LAST LOWER TOOTH)
What I've noted is that, generally, JW blades (both Coronation Ace and Four Aces) have got a Drag Pick more curved to the bottom. MK Professional, on the contrary, has got a Drag Pick more "plain".
Obviously, I don't know anything about the usefulness of having a prominent drag pick or not... sorry