First. Primary emphasis on specifications disappeared because, while not meaningless, they are a distraction and are frequently deceptive. The only reliable way to characterize high end audio equipment is descriptions of sound characteristics.
Imaging is as @frogman points out only one of many characteristics of a good high end system. Some folks consider it an important characteristic, some could care less.
How well your system images is the result of all components of your system, venue and speaker setup.
I would start with What you have. Optimize it, then decide what the next step should be.
The most useful thing you can do, to allow us to help is to put photos of your system and venue. This way we have some idea of what is really going on. There is a place under your UserID to do so, under virtual systems.
Step one will be slow methodical adjusting speaker placement. Get the triangle correct (speakers and chair), wall distances. Your ears need to be at tweeter level for most speakers… these are what are doing most of the imaging. 1/8” difference on placement can make a difference. Toe in is next. The soundstage opens up as you go from the speakers pointed at you to straight ahead…but, too far and the central image collapses) So this is not a quick process.
Then room treatments. If your front and side walls are too reflective then the imaging is confused… you can see my main system to see some of the treatments I have used. The really heavy, thick wool rug on the front wall profoundly improved the imaging in my system. The images go deep into the wall (so, 4’ to the wall and 5’ into the wall), and on both sides of the speakers (so for me the soundstage is about 12’ wide). In special recordings I can hear sounds behind me.
You can find detailed instructions about how to approach the above two activities.
Then there is your system. Top priority is speakers that are known to image well, of an appropriate size for your room. High quality stand mounted speakers can be the easiest to get great imaging out of. Then there is your electronics… in general, the better your equipment the better it will image.