Is it worth replacing a Lumin D2 with an Eversolo dmp-a6 Master Edition?

My own experience suggests you will be well rewarded by pairing your very high quality DAC with a streamer of at least similar quality (and unfortunately, expense).

I'm with you on this. I saw a person on Reddit r/audiophile  with $30,000+ worth of new speaker, dac and power amplification planning on using a WiiM Pro for a streamer because in his words, "bits are bits." so it didn't matter.

Oof, that subreddit is pretty much an extension of AmR (aka ASR) and consists of a somewhat younger crowd of HiFi saviors. To each their own, but agree - there may be more to it than “bits are bits.” 

My Dad just received the Eversolo DMP A6 Master last night.  Set up was super easy.   I had it set up in ten minutes. First impressions are really good.   I have always been skeptical about Chi Fi but it is a slick well thought out package that sounds really good.  I am going to bring my RME DAC down at some point to compare its analog output.  
 

Looks like a good product so far. 

I have no experience with Lumin so I can’t recommend one device over the other.  I have an Aurender N200 and this unit can do everything that can , and then some.  It is pretty impressive so far and sounds very good

Selling my Eversolo here if anyone interested: 

https://www.audiogon.com/listings/lisb605j-eversolo-dmp-a6-master-edition-music-servers-docks