Well, Sonic in Fenix 1 isn't too good, is too short, the Metal Sonic is too easy... And rings... If I put they in 100% and not in 200%, they will see too small... I already tried it... And in 150% they look bad...
The sprites from Sonic in Fenix 1 and 2 of Sonic and enemies are taked from the sprites of Sonic XTreme that appears is SoST (I supose that you already know who are SoST, no?). ;)
Sonic in Fenix 2 is more good: the leveles are four times greather and more labyrintics. Here are more rings and the levels are more movedizes. New items appears... In zone 2 (not level 2, eh? Game is also divided in Zones and Acts) the angles also appears...
Also, this time, you need to get the seven emeralds... After it, you also will enter to the "Unknown zones" at the end of the game for take the Master Emerald...
Is simply good.
PD: somebody want the level select cheat?
EDIT: SRB is obviously best that SiF. ;) Really.