Whatever it's called "ski" or not,costly than F-22 or not,gen 4 or 5, Russian is too soon to unveil this fighter, it still didn't have proper radar or engine for described as stealth fighter how it can counter fighter like F-22.Russia just countered problem with brand new Bulava missile complex for sub, canceling T-95 just before it get publicized, BPMT IFV too.Russian looks not serious managing this kind of business, a lot delayed and what? cancel it? T-50 seem not entirely stealth,Russia made MFI, Berkut and later they only become technology demonstrator, what a waste of money.Also they abandoned LFI program in favor of T-50, although it said Russia now have poured more and more money to defend their pride in military build-up,they still don't have enough money to do it.I wonder why Sukhoi alone build such so important project like this, without participation of MiG (they experienced in handling design all of soviet era fighter), Yakovlev (JSF born from one of their brainchild),engine maker like Saturn-Lyulka, radar designer like Thikomirov,material maker, production plant all in handling T-50 project,much coordinated, more efficient and effective, no need delay anything if they solid,organized in managing they duty.