I am somewhat skeptical, about the benefits of the uncompressed Sony raw format. I have seen some cases where the delta coding showed up, like the demos on DPReviews and the start tracks image that Diglloyd has shown. Those artefacts are facts in my view. It is a good thing Sony got rid of that.
But I don't really think there are other benefits of the uncompressed raw, or if there are they are not obvious to me.
I set up a difficult target, intended to use all of the dynamic range and have a lot of smooth graduations. So I have porcelain coffeecup and a black one over anthracite and a reflection in the glass behind.
Some crops are here: http://echophoto.dnsalias.net/ekr/Ar...AWCompression/
The raw images are here: http://echophoto.dnsalias.net/ekr/Ar...pression/RAWS/
This crop is a highlight area, one stop below saturation:
This one is near black uncompressed:
As a side note, importing the files as DNG in Lightroom gives comparable file sizes.
So, what is my take on this? Mostly that I don't see any obvious artefacts. There is a small difference in tonal scale. It could be a variation of flash output, but I don't think that is the cause.
From what I have seen here the compressed and the uncompressed file are very similar.