Yes, for me it's most noticeable improvement is in the albums of the 60's 70's 80's. It seems to reduce the nose floor, and the extraneous sounds of some of the recording gear or recording enviroment. Some of the MQA files I'd listened to barely sound different or improved. I've given up comparing MQA to non MQA files, and generally select the MQA when given an option.
I prefer SACD and DSD for SQ. MQA is not the be all and end all, I imagine it to be a stepping stone in the eventual realization of the digital format.
I didn't realize that master tapes would be batch processed in MQA. And I had imagined that with new releases, the album engineer would have been involved in the MQA process. And I'm surprised to read here that there is less data being steamed. But being said, it could be a cost/bandwidth saving for the streaming company.
I also think that given time we will be able to stream DSD quality. MQA might evolve, but digital files, streaming and down-loading are the winners here. Although vynal is fantastic, I haven't spun a disc in 18 months....