did you chek the video in the link too ? what you mean about the crystal ?
I mean the distortions he gives.
They are always there, and may differ in different factories and some generations have more of them than others. The noobs in their best periods , had almost no such distortions.
They were strong on my ZF, it was difficult to choose an angle at which they would not blur.
In the photo xf in this thread, there is more distortion than I would like to see. On the video and photo from your link, there are almost none.
Here you need to understand that this is often a question of each specific sample, and secondly, again, gen is also very different. Thirdly, the crystal can be bought and replaced, it is not very expensive. Finally, this is largely a matter of taste and personal preference.