I did not prefer this version of Sasha's swan lake, but I do feel that overall she has definitely improved. I thought she looked more powerful and more sure of herself, especially in the SP (best performance I think I've ever seen her do btw). There seemed to be little improvements, such as with her spirals, her speed, her jump runouts. I'm not sure why her LP seemed to have next to no choreography. It just was not as interesting IMO, but I had read good things about it in the QR so maybe part of it was just Sasha was being tentative?? Joesitz stated that her QR performance was very good. I think this World's has been incredibly successful for her and is a good stepping stone. Both her and Michelle will likely need to have 3/3 over the next couple years. There are a lot of really good jumpers coming up and you can bet that at least one (Shizuka) and likely more will continue improving their artistry as well to catch up to Michelle and Sasha.
BTW, I was wondering if perhaps JK appears to have lost weight partly because she's been doing pairs lately? Maybe she's trying to stay extra-slim??