NX200 colour cast

So the NEX7 has a serious problem with some manual wide angle lenses and a magenta colour cast which is speculated to be a micro lens or IR filter problem (the NEX 5n doesn't though). This caused a bit of concern with me as the NX200 at 20mp was also nearing the NEX7 pixel count and I like using manual lenses. At first I saw nothing with the NX200 so I relaxed but the other day when taking a picture of a grey tile I noticed something and set about experimenting further. The NX200 seems to have a similar problem but to a much lesser extent. This is one of about 50 shots I took of a concrete wall testing but all the rest have almost the same shift in color from magenta to green from left to right.

You might not notice it at first but I've put the NX100 picture below (which shows no colour shift although maybe a bit from top to bottom).

The last photo is the NX200 one with high saturation to make it easier to see.

Now I've checked and this happens for multiple lenses (less sevre with telephotos but still there) and I suspect its my IR filter thats out of alignment. I'd be interested if other users of the NX200 with some manual glass could do a similar test to see if this is NX200 wide problem or limited to my copy. Strangely its almost absent on the native lenses (20-50 and 30mm) but you can see a consistent pattern when you turn up the saturation so perhaps the camera is doing something to reduce it then?