For a piano of this caliber and price point, the concept of "value" becomes wholly yours, and won't have smooth/clean ways to compare with something else from a "value" standpoint.
As someone who's spent quite a lot on several acoustic pianos (including an SK-2), my best advice is to make whatever purchase, and be content with it. And no regrets. Appreciate your instrument.
If you get the SK-2, focusing more on the amazing creamy tones, and that you got it at a very nice price; if you get the SK-3, it's also a very nice price, and that the "$7K was totally worth it."
Whatever the case may be, do not look back with any regret. You ultimately have the agency to tell yourself whatever narrative you wish to tell yourself.
Case in point, if I didn't buy my second piano (concert grand, 9' has tons of bass etc), then it's easy to go "but what if?" and keep desiring what I don't have. Now that I have it, I could very easily say, "I wasted my money, it could've gone to [fill in the blank].
I was content with "just the SK-2" and I am content now with the SK-2 and 280VC. Despite the cost. Yes, it was a "great value" in my own little world, despite the hefty price tag.