In regards to the season two VFX being completed by a different company, I did notice in the trailer that the Enterprise looked markedly different, with it lacking the 'oomph' that season 1 had, also the planets in the before and after shot looked almost identical. I was hoping that the style done in season 1 would be carried over, however it appears that it may not be the case.
Are you talking about the stock shots that ILM created for the pilot, or the new shots that were done at the Post Group. Because I would expect some differences as the amount of production time the pilot effects had is much larger then the time a normal episode would get. So I would naturally expect some change in level of quality. Not to mention as the production team expanded their supervisors, each of them provided a different style to each of there episodes, and a Legato done episode in season two is going to look different then even his own episodes in season 1 (they talk about how they run themselves into the ground in season one), let alone the difference between Legato and Curry.