So I got mine.
First impressions of the main differences.
The mast is MUCH heavier, it's certainly solid carbon and has a lot more surface area than the Spotz2;
The front and rear wings are higher aspect and have a better finish compared to the Spots2;
The Shark is 800g heavier when compared to the Spotz2, this will surely be down to more material in the mast and foil.
The profile is a lot flatter which falls in with most other race foils these days;
The mast is a lot wider at the top, by the tuttle;
Overall, the foil is a LOT stiffer, as in it's like night and day when compared to the Spotz2. The mast is a total weapon now and feels totally solid.
I hope to go out this afternoon so will feedback later today! I know my stats on the Spotz2 so will know if I am going any faster or higher upwind or deeper downwind.