I would approach it differently. Are you an analytical, impulsive or emotional person?
If you are analytical, you will find and likely appreciate the differences. From your post, you are not though.
The improvements have been significant but it benefitted the lower segment more than the higher tier. (NOBODY WILL AGREE WITH THIS HEHE) That said, you can buy speakers in the 5K neighborhood that beat your current speakers, emotional, impulsive or what not. Personally none of these speakers on your list get me excited but they must be great.