Based on the SD7 hybrid which I am listening to as I type. And going off of the sound signature that are on these hybrids. The mids are actually done really well on these and has a layering/ imagery that a lot of my other earphones lack. One thing that graph doesn't show is how dimensional the sound is. Something that I absolutely love about the SD7. Especially in balanced mode. I think in single mode the mids arent as forward but sound is still very dimensional. In fact I would take these SD7 hybrids over the more expensive one more quad which try to do the exact same thing but does not have the same treble extension or the bass extension of the SD7 hybrids. It is everything the one more quad should have been imo.
I like that the bass on the all BA SD7 plus is emphasized. A bit more oomph on an all BA earphone is not a bad thing. I am sure it will not have the same impact as the hybrid SD7 but should make for a solid bass end. If that graph is true it looks like it has minimal roll off in the sub bass which is excellent for an all BA earphone. One of the remarks on the earphone on Aliexpress is that it has good bass. Which I would imagine looking at that graph.
Another interesting aspect of the SD7 hybrids. I mentioned in an earlier post that I was using complys to soften the highs. Don't know what happened between then and now but I am now using silicones for them and the highs are just fine. Looks like I underestimated the burn in for the earphones a bit. They do require some time for the sound to get right it seems.
I am slowly getting hyped about Rhythmos, SD6 and SD7 obviously punch above their weight and SD7+ might be the best they've got. Looking forward to your comparison between these 2, the differences will probably be much more audible than the naming would suggest.