Hi RedJohn, sorry for the late reply. I'll try to compare the two. I only use the EX1000 at work with a CEntrance DACPortSlim, and the ASG1Plus at home with a combo of HiFiMeDIY Sabre DAC / homebuilt CMOY amp or Magni2/Modi2 Uber stack or Sony Xperia Z1 smartphone. So please take my comparison with a grain of salt.
The EX1000 is a relatively mellower sounding headphone to me, kind of like if you were a few rows from of the stage. It has relatively flat frequency response but with really good extension in the bass and treble, nothing really stands out on its own, it's very natural sounding. I like this because nothing jumps out and grabs my attention, it's just really easy to listen to. (I should note the XBA-A3's bass would constantly bug me because I felt there was just a touch too much of it, if that helps. That was probably my biggest problem with it.) There is good detail retrieval and the soundstage is wide. Poor isolation though, but I like that because I need to hear things around me at work. It's very comfy too, I can wear it for hours on end. So far it's been the best IEM that I've used at work, it ticks all the boxes for me.
The ASG1Plus is easily the best IEM I've ever heard, but it's also the most money I've spent on an IEM. My experience is limited with higher end IEMs. If the EX1000 sounds like your a few rows back, then the ASG1Plus sounds like you're right in front of the stage. It's kind of in your face but not in a bad way. The bass and treble extension are just as good as the EX1000 if not better, but with a touch more bass. The bass has better texture and is really tight. It's a more visceral experience than the EX1000. The mids are awesome too, I love the way vocals sound on the ASG1Plus. Detail retrieval is great and the soundstage seems a bit narrower than the EX1000 but the instrument separation is much better, it's way easier to pinpoint things in space. It's more 3D. Isolation is really good, much better than the EX1000. However after an hour of listening to them my left ear hurts from wearing them. The ear guides are also kind of a pain to deal with compared to the EX1000.