Can bring more sharpness would, or less depth of field

Since I only have fast lenses so far, I have in terms of brightness noticed no difference.

But soon I will be a telephoto lens with a maximum aperture 1: 4.0 might have. Bin then curious if the viewfinder image will then be bright enough.

Now for manual focusing:

So please do not be great expectations! This focusing screen is only marginally better than the standard focusing screen.
If one thus operates at close range, and macros of the difference is probably subjectively better recognize. But if you have normal distances or farther subject, then I notice little improvement to standard.

So for example for Party Photography with group photos, I think you still remains better at autofocus and can also leave the normal matte screen.

Because I would have a stronger effect expected, there are only 3 out of 5 stars.