If the 100ii keeps me satisfied than honestly no I wouldn't see a need to upgrade even past that, there's a certain level of quality where I become content. I believe the ak100ii is the cake & anything after that will simply be more icing. For me it's the factor of if the extra 2G for a 240 is worth the cleaner sound you may get. I have no problem paying for the best but only if I feel it's worth it.
My IEM's are a different story tho, I must have the latest that Shure is offering which I do 😜
Local stores in the area sound be getting both daps in this month, I've been dying to test all 3 out. I'll have to sit down & test them with my own ears I suppose.
Also do you believe that ak will release a 240ii anytime soon? I'm not up to date on the news & when I searched have yielded no results.