Yeah sure.
The CKS77x is a bass monster, there's no other way to put it. Normally that would be something I don't really enjoy, but the CKS have really upfront mids as well which makes them sound a lot more balanced than your usual basshead iem's. Vocals are upfront along with the bass which is really nice, and the air chambers give them a pretty spacious sound as well. I would only recommend these to people who really love big bass, because they are fun as hell to listen to but can get fatiguing after a while.
The CKN70 is the oldest of the three, which is weird because they aren't even a year old yet. First things first, the cable sucks. Some people have said they don't have a problem with it but for the amount they cost, the cable should be better. Soundwise, I love these. They are pretty bright-sounding (verging on harsh), and can be aggressive with some recordings. That aspect is balanced out by the slight warmth in the mids and the VERY tight bass. I would only recommend these to people who don't mind aggressive treble. They are super somfortable though.
The new kid, the IM50, is a completely different signature once again. These are very mid-centric, but not at the expense of the other frequencies. Really balanced overall and a great all-rounder, so I would recommend these to anyone.
As for how they compare to each other, it's sort of like apples and oranges because they are all so different. For bassheads, the CKS77x is amazing. For those who want aggression and precision, the CKN70 is great, and for those who want lushness and balance, the IM50 is great too.
I would say the IM50 is be the best out of the three, purely because they are suited to pretty much every type of music, whereas the other two depend on genre a bit more. However, I think the CKN70 has the upper hand in the bass department. Those micro-drivers put out seriously tight bass, and in comparison the IM50's bass sounds slightly slow.
It really depends on your preferred sound sig, which is why I love AT, because they cater for everyone's preferences.
If there are any other aspects you'd like me to compare, just let me know.