K-01 or K-03x vs K-03

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A newbie to the site, so my apologies if this question's been posed already: Have enjoyed Esoteric digital sources for many yrs in our 2-channel system - initially the x-03se, and then the k-03. My question for those who have made direct listening comparisons is whether there are significant improvements in many aspects of the presentation with the K-03x? I'm aware of the versatility improvements, etc. and the increase in sampling rate, but what have your ears told you? We have an opportunity to essentially make a lateral investment move to a preowned K-03x, however do not have an audition opportunity. For that matter, a colleague is preparing to let go of his K-01 to devote his system to all-analog, so perhaps a 3-way comparison is in order?! I appreciate any experienced thoughts members may have. Thank you ~