Pioneer and Yamaha receivers were not able to get multi-channel SACD DSD working with HDMI 1; some Onkyo and Integra users could not get anything through HDMI 1.
The new firmware should allow Pioneer and Yamaha receivers to do stereo/multi-channel SACD DSD; some Onkyo and Integra users to at least get stereo SACD DSD.
If you are using the player's ability to do SACD DSD to PCM decoding, then there is no performance difference in the new firmware in this regard.
I tend to look at the threads relating to problems that I am actually having, rather than those I am not. :-)