Then, yes, even if your proposal is a really severe "what if". Imaginating German industry having continue to develop, at this times, some very high performances a/c, it could give : close to, or supersonic aircrafts.
Reliable, powerfull afterburning engines.
Highly modern, clean aerodynamics with reasonnable (or more) maniability.
Hard hitting, very high RoF and accuracy canons, coupled with high precision (at last) gyro (+radar ?) gunsights.
hard hitting, low to medium range self guided missiles.
Kind of fully operational Me P-1101, Ho229, He162 or Ta183 indeed.
Or better, depending on politics and budgets.
We can too imagine such fighter aircrafts Geschwaders under, say, Erich Hartmann, heinz Barr or Adolf Galland command.
But not against MiG15 or F86.
Meteors, F80, maybe better...
Other than German techs would have rushed reaching the level by this time and, why not, with success, with many skilled, experienced pilots and leaders too...