Hoya Singapore doesn't have blue absorb yet. So only blue coat variant.
Optics wise, Hoya would have better clarity, esp during dim light/night time.
Talking about the exact same prescription, when upgrading from Pentax to Hoya, won't really notice alot of difference. But if downgrade from Hoya to Pentax, you'll feel, somehow, images are not as clear as before but you can't really put a finger on the exact feeling.
That's why when my clients upgrade to better optics lens like Zeiss & Tokai, I'ld always warn them it would be hard to downgrade in future. The level of clarity is different