You have not mentioned enough information about your display's native resolution and the signal source format you are viewing. Is it a 1080p display, and are you viewing 1920 x 1080 programing, such as Blu-ray Disc?
If detail is getting lost that's a resolution issue.
Like George mentioned above the programming and display have a largely dictate what you'll be able to resolve in the final image.
Make sure all your gear is setup to pass the native resolution of the content.
Make sure you have sharpness set correctly on the display and that the display is in the mode that maps pixels for pixel (bit by bit, just scan, native, different manufacturers call it different things).
The thing with the sharpness control is -15 might be a good setting or might not.
you'll need to put up a sharpness pattern (usually just a grid of 1 pixel lines ) and adjust it till you don't see ringing.
Sharpness controls are tricky, if you could talk to the engineer that designed the control, they could tell you the settings that effectively disengage the sharpening algorithm. There may even be a range of values that don't apply the sharpening filter. On some set when you turn the sharpening down low enough it will start to actually blur the screen, so that's why you really need to look at a resolution pattern and adjust it till it is sharp but without ringing.
Only a bad sharpness test pattern would have 1 width of line. The good sharpness patterns have multiple line-widths because Sharpness can be applied differently to different widths of lines. The right setting for Sharpness won't produce artifacts on any line width. And the pattern should have both horizontal and vertical lines... Sharpness sometimes only works on one or the other. And some displays have separate controls with different names, one controlling artifacts on vertical lines, the other controlling artifacts on horizontal lines.
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