I recently cut out all dairy products from my diet and now use a plant based protein powder instead of whey.
There are a lot of really good plant based products on the market, the problem is that most have a lot of carbs in them. Not really an issue for someone like me with a fast metabolism but most people would do better off with a pure whey isolate since it's pretty much carb and fat free.
Vegan and plant based diets are great for health...but not great for bodybuilding. Animal protein is much more efficient at building muscle then plant protein.