No, don't think the Images are superior to Sleeks. I own both and will keep both. I just like the combo of comfort/SQ the Images deliver, so I use them for walking, which I do a lot of. I use the Sleeks more at home, or on planes, trains, etc., because I really do like their more mid-high focus, and the SA6 bass is also good enough, with the bass+ mod. Like having two excellent suits, there are occasions for both. Highs on the Images never fatiguing to me. The other main upside to the Images is they are self-enclosed, no interchangeable parts, which is a plus for the Sleeks, but also can cause some durability problems. Both have two-year warranties, so I am not worried on that front.
I'd love to hear the IE8s too, but enough already (for me buying and selling). If I were starting tabula rosa, I might try the IE8s first, but I do like have two excellent pair of different high to mid end IEMs. I also own the im716s modded, so I have an ER4P-like IEM as well for detail over warmth.