Do you happen to have any black frames and white frames at ISO100?
If you set camera to 1/8000th, put the lens cap on and snap a shot and then set it to an exposure long enough to blow the image out to pure white, all channels blown, over a large chunk of the image, from those two shots, the RAW files can be analyzed and you can find out the SNR, DR and low ISO banding characteristics.
That could answer the question as to whether they have approached Exmor sensor dynamic range or not.
And whether they have fixed up the pattern banding some.
(Assuming software such as IRIS would be able to at least partially open the files.)