I made the transition. Sold my Nikon D300 and bought myself the all glorious Canon 5D Mark III. I don't regret it one bit. I'm still learning as it has different buttons but it is awesome. Being new to Canon, the first lens I bought was the Canon EF 50mm 1.4USM. It is sharp and fast. It's my first lens but not my last. I mainly do landscape photography but on occasion some portrait work too. My question is, which would be a good portrait lens for indoors. I mostly work with natural light. And, I also need some suggestion for landscape lenses. I'm asking for help because I know nothing about Canon lenses but I'm beyond excited and happy that I made the transition from Nikon to Canon.