Ok, So after a few runthroughs to test out all the forms, Here's a current list of what each does. They all have a pretty hefty ki drain of 660 ki/s or 360 ki/s when mastered

Lust
+550% Damage
+35 Defense
+100% Ki Costs

Wrath
+750% Damage
+100% Ki Costs

Sloth
+500% damage
-65% speed
+35 Defense
+100% Ki Costs

Gluttony
+200% Damage
+100 Defense
+100% Ki Costs

Pride
+350% Damage
+25 Defense
+300% Ki Costs

Envy
+350% Speed
+25 Defense
+300% Ki Costs

Greed
+350% Speed

I'll try and keep this post up to date with any updates in the future, but I can be a bit lazy and forgetful. If there's any wrong info on here, go ahead and leave a comment on my profile about what needs to be fixed. I should fix it in a few days.