The animations are more complex, and he has several AA animations that he cycles through. His E effect alone almost makes it worth to me:
https://2.bp.blogspot.com/-9X7NfmK1k2s/WNGyl2clO8I/AAAAAAAAgfs/Qabn-uGiwuc4f92Sp1n_b19Bm1ettzqmwCLcB/s1600/leesine.jpg
From the post about this skin:
- All-new model and textures (God Fist Lee Sin's training has honed his body and mind, showing through his muscular model, divine markings, and third eye headpiece.)
- All-new VFX (His attacks and abilities strike with transcendent power.)
- All-new VO and SFX (New voice lines and processing to match his powerful sound effects.)
- All-new animations (New varying auto-attacks, new Resonating Strikes that change at differing travel lengths, new ways to send enemies flying with your Dragon's Rage. He's learned many new moves through his training... including dance moves.)
- Ward-hopping to the God Fist Ward, while using God Fist Lee Sin, will also trigger a special ward animation
https://www.youtube.com/watch?v=8eeIBCZlJaY
I think it is worth 1820 RP, but that is just my opinion, on the other hand you can't deny all the work that has been done on it. It is not simply a modification of his base model. Not at all.