You can easily measure the crosstalk. Have a left or right panned channel feed a bus with the emu on it, and pan or measure only the opposite side. If there is activity there, then there is crosstalk.
Having said that, this is not the end all be all of getting a nice sounding, realistic reacting console emulation. As I said in the other threads, I do not find these to be console emulators but more like digital saturators. What confirmed this for me is not just the sound in a couple of A/B's but also the contradictions in how they are to be used. For me, if they were truly developed to emulate consoles, we wouldn't be using them last in the chain as it has been established. If they are modelling input distortions and frequency responses for example, they should be first! Then they chalked this up to the fact the emu is performing summing. But summing doesn't happen in the channel! That would have been taken care of in the bus.
Because of the sound, response, and the utter contradiction in use, I do not deem these as console emulations. But, again as I said, they can still be useful as saturators with the right use.