Right from the
GSM Arena's review on the 8x:
Sadly, the HTC Windows Phone 8X doesn't do all that great when it comes to image quality. The camera is usually able to get the exposure right and has good contrast and dynamic range, but the amount of detail it captures is average and the noise levels are fairly high.
Since the camera seems to be important to you, I would say "No, it isn't worth it!". I had the device myself back in the days when it came out on T-Mobile USA. The camera was a nightmare. Auto focus never worked the way it should. Even in videos, it continuously kept zooming when holding the phone steady on an object; got even worse when moving.
Shots taken with the
L640 look much better with far more detail. Keep in mind: both are 8MP cameras, except, the 8x's camera is from a few years back.