If you want me to be honest? I don't like the old sprites as much as the new ones, I think it may be nostalgia factor for a lot of people, and the new sprites for Lake and Bjorn are just so beautiful dude.
That's my sincere opinion, I'm sorry, It's not like the old ones are ugly or something, they just look off when you compare it to the rest of the VN and the CG's, like they are different characters.