Sonya is and I'll tell you why. Skarlet cant zone for shit. She will always lose a trade cuz her projectiles does chip on hit while other characters will get their 8-9% damage. Her armor such as ex red dash is nothing more than a parlor trick. Theres no need to ever block low. Everything she does off armored red dash is negative and can be comboed. Same goes for her teleport. You can fuzzy guard her slide and get a free throw attempt or free block strings going.
Skarlet isnt bad. Shes def tourny viable but shes just not in the same league as Sonya imo.
I'd like to re-word some of what you said...
her projectile does 4% on hit, and is the fastest recovering iafireball move in the game - so technically she
can trade an iaBD and duck the opponents projectile, but it takes practice to do so.
I'm not sure I understand what you mean by EX red dash being a parlor trick - it does give her multi-hit armor that's only beaten out by other multi-hit EX specials that are begun after her EX red dash.
Red Slide is -3 to 0 advantage on block, depending on when you use it in the animation (the later, the better in terms of advantage).
Her teleport needs to only be used on reaction to a projectile/special to close distance when wanted. All of her specials, excepting certain Red Slides, are punishable on block (EX up slash is the best one at -7).
She can't really be compared against other characters - Skarlet is her own little ball of strange that has potential for greatness (
in my opinion). To me, it's kind of like comparing Rain to Quan Chi or Nightwolf...they're totally different characters with different playstyles and strategies...I'll leave it at that