Maybe, maybe not. A friend from the past was support on one expedition, he went up to advanced base camp (20,000 feet) and that was it for him. Said he had zero interest in going higher, the whole thing really freaked him out.
Of course he didn't pay $200K, he only paid for his flight to Nepal.
Also acclimatization is a fickle thing. One year you go to 22K feet, the next year you're vomiting at 18,000 and can't get acclimatized.
"Fitness" doesn't guarantee it either. The first year I was there two guys died (days apart) on the Cho La pass, about 18,000 feet.
One was 22 years old (people said he was going up too fast), and the other a 54 year old Swiss mountaineer who'd done everything the right way. They both keeled over and dies with no warning, more-or-less instantly, from what I was told. No big melodramatic struggle to live. The Swiss guy was talking a group photo, suddenly fell over, and was dead. Boom.
That’s true. But my point was, that if you’ve got the money and your body holds up it’s “doable” for the most part.
But from what I’ve read, K2 is absolutely brutal even compared to Everest.