MPEG 1

   Studio Pro -  Consumer Quality

MPEG 2

   Sony -  Highest Quality Available
   Sonic  - Enterainment Quality
   DVD Pro  - Business Quality
   Studio Pro -  Consumer Quality

 MPEG 4 

   Sony -  Highest Quality Available
   Sonic  - Enterainment Quality
   DVD Pro  - Business Quality
   Studio Pro -  Consumer Quality