At full capability, yes, it is. However if you don’t have the updated targeting data then my understanding is that it loses a lot of those advantages. And even if it didn’t, it may still be a case that it’s more cost effective to buy higher quantities of slightly inferior aircraft.
It’s hard to know for sure, though. The only true information we’ll get is when it’s used in a hot war and hints if or when countries reduce orders.
The F-35 is the only genuinely stealthy aircraft any country outside the USA has access to (other than China, and the efficacy of its stealth technology isn't known). F-35 stealth is a game changer, as seen in every exercise in which they're involved.