Here is a caparison between a Epson V800 scan and a 'scan' done with a Canon 5D3, Olympus bellows with slide copier, an OM Zuiko 80mm Macro, the same lens and combination that took the picture of a dragonfly in the Dordogne France in 1986 on Ektachrome 64.
The Canon picture is larger (below) so has been resized to approximate the size of the Epson result.
I have processed them both in Lightroom
Epson flat, no sharpening at all, scanned using Epson Scan, Auto exposure to get the grey balance, slackened the highs and lows in the histogram and brighten the mid tone. No ICE 3200DPI 48 bit exported from Lightroom to Photoshop
Canon I resized, tried to match tonally, also no sharpening. The Canon has too much contrast as Raw.
The original film has resolved the eyes, so I have 100% screen grabs of the area.
I used Live view, magnified the area x10, used the bellows to focus on the eyes, stopped down to F8 and after a few test exposures used this one.
I can post the images separately if required.
PS the Epson scan is a a little narrower than the Canon, as it seems its vertical and horizontal resolutions are different.