This is propably the first true Sports diesel car. However is a tuner work, but i belive Alpina even is a BMW tuning company its an independant brand.
Here is good comparasion with regular M4, and its actually isnt looking bad at all.
http://www.youtube.com/watch?v=NoRAeL8qgSM
So maybe its matter of time, maybe few years, when big concerns will get to the place where tuners like Alpina stand now. I belive Audi, BMW, Mercedes, maybe Jaguar or new Afa Romeo's hae potential to make true sporty diesels in future.