However, I'm personally not a fan of his work. You called Mistborn "God-tier" fantasy, but personally and absolutely cannot agree.
First, the books are far too long. I have nothing against long books, but a majority of this series comes across as filler. I felt Well of Ascension for example could have been half the length and nothing would have been lost. That whole book was practically a single siege, a poorly executed attempt at a love triangle and Elend being an idiot throughout. The world and setting in the series was so fucking bland and boring. I know there is no plant life (green plants and flowers anyway) and the world is covered in ash, but it just felt lifeless and unexciting. Personally, I felt the world building was rushed and needed more time in the oven.
Stormlight Archive is a lot better than Mistborn, but again it suffers from being far longer than it needs to be.
Just my personal opinion. I understand I'm in a minority here as Sanderson has a huge fan base.