The EXRs output by imf_copy are viewable in the file node and the viewport (I can’t run 2.0 on this machine but don’t use that anyway even when I can)
But keep in mind this is most beneficial for large textures so loading it in the viewport might become expensive.
As for extreme close-ups of a texture showing artifacts, that’s to be expected. Textures at the lowest pyramid level are their base (original) resolution, which may be ineffective when close. That’s the same as blowing up an image and seeing pixels. Filtering cannot create data where there isn’t any.
However, mipmapped/tiled textures can be very large in size/resolution and handled efficiently when rendered so you can use a higher resolution image to begin with that will hold up to a close-up.