LOL, all of those concerns will be addressed in the future prototypes. The first two are no where near the production models. The F-22 prototypes didn't have perfect surface finishes, there was no need for that. Why worry about the finish when you have more important things to test. Its been stated many times that PAK-FA will get new eninges with Flat Nozzles like the F-22. Also, Sukhoi seems more than confident in their inlet configuration, if the proposed radar blocker works as well as it can in theory, it will be just as good as an S-duct. If you take a look at the earlier designs for PAK-FA they originally included S-ducts! They were taken out for a reason.The biggest problem of the T-50 is that the current prototype is hardly stealthy at all. Its rough finish, uneven surface, exposed blade, untreated exhaust make no stealthier than some fourth gen fighters like the EF-2000. I doubt if the RCS is less than 1m2 at the current configuration. The T-50 needs some seriously improvement before it can be considered a stealthy fighter. Sure it is very agile, but what's that good for when the enemy can see you and you can't see the enemy?