Would Sonya have any losing match ups?
Freddy. Thats it. Freddy has ass footsies compared to Sonya and no armor though. Basically Freddy has to keep her the hell out, the second she gets in it's over. He fairs better than Smoke in this MU because his projectiles do chip, control space, and frame trap, also his Ex Tele has invincibility, so he will be much more successful at keeping her the hell away which most characters in this game want to do.
Kabal isn't
horrible for her but it's a bit struggle i guess, Kenshi is probably her worst MU because he can actually space, zone, and advantageously armor her.
Cyrax imo goes even because he can get easy resets for damage, control space with bombs + net, and if need be even drain her Ex Kartwheel meter with Ex Net (nothing huge but something nice to have I suppose). He has no real useful armor though, and AA grab wake up (which is amazing and Cyrax players love to use due to it's safeness) is checked up by the D4.