which is not exactly the combat I mean
by "combat" I mean "fight"
Oh don't be like that.
I understand what you mean and I was kidding around. The F-35 in Afghanistan is waaaay overkill. I completely agree and doesn't show off the capabilities of the jet. It does give mission experience to the pilots and if they are dropping bombs, they are in combat. Not high end combat, but combat.
The only places where there is likely to be any high end combat are Syria, the South China Sea and Iran. Perhaps in Korea, but that's a toss up on any given day. Iran and the South China Sea are more likely just to be folks flipping each other off for the time being: I don't see an Operation Praying Mantis any time soon. Syria, as we have already seen, has the chance for being a flashpoint, but most sides want to avoid that as much as possible.
TBH, by your criteria, no Chinese jets have seen combat over 25 years. Who knows how they will perform? Likewise, by that same standard, the Russian jets haven't seen combat since the
Iraq war and those were export models and probably in bad repair. How do we know how
they will perform? Do we think anyone's jets will perform better or as well as anyone thinks? Based on history, no one's jets will be as good as claimed. We will also see a whole bunch of capabilities we didn't know about either.
Nobody's jets have been in combat by your standards. That would require a high end, peer or near-peer fight. As much as I find militaria interesitng, that sort of combat is something I, honestly, hope the world avoids.