The issue here is not sharpening, but the colour output space, and yes MPC-HC uses shaders to do it, while VLC trusts the GPU so far. And some nVidia GPUs have

The issue here is not sharpening, but the colour output space, and yes MPC-HC uses shaders to do it, while VLC trusts the GPU so far. And some nVidia GPUs have a wrong colourspace output, which makes the colour to be faded...