Volkswagen CEO says Tesla's meteoric rise proves the most valuable company in the world will be in mobility (TSLA, VW)

· Volkswagen's CEO is an outspoken fan of its competitor Tesla. 
· Herbert Diess said Tesla's second-quarter results last week were proof that mobility will be one of the most important industries of the future. 
· His comments come as Tesla's CEO Elon Musk once again toys with the idea of partnerships with competitors,...