I have given up on trying to find a decent, well made modern film scanner. I have in the past bought an Epson Perfection V750 and a Plustek Opticfilm. Neither of these produced really sharp scans. The problem lies in the absence of any focus device on these scanners, like the better older film scanners used to have, so you are dependant on the manufacturer of the scanner and usually flimsy, cheap film holder being in absolutely perfect register in relation to the scanning lens and sensor. Manufacturing tolerances can result in your having a satisfactory scanner or as in my case, not. I then thought about buying one of the excellent Nikon Coolscan Film Scanners but these are getting old. Even though there are experienced service engineers who will service/repair them, you are at the total mercy of Nikon continuing to provide spare parts. I have already suffered problems with the absence of spare parts for cameras (circuit board for Leica M6TTL), so am not willing to rely on Nikon's willingness to continue with spare parts for their obsolete scanners. I also looked at an older Hasselblad-Imacon scanner but these use the SCSI interface, which is obsolete. The available SCSI to say Firewire/USB3/Thunderbolt convertors are far from satisfactory in my experience and the last maker of a chipset for the conversion, Ratoc, has now ceased production.
What is the solution then? I have gone back to an earlier technique, which is future-proof. I am using a Leitz BEOON film copying device with a Schneider Kreuznach 50mm Componon S enlarging lens (high resolution and very flat field), a Leica 24MP SL camera and an LED light panel to scan films, mainly black and white and colour reversal. The focus and sharpness is completely under user control and you end up with high quality DNG 24MP/45MB scans, which can easy be handled by Capture One or ACR/Photoshop. I have even found this is quicker, once you are set up, than using a traditional film scanner. I can scan 36 x 135 images in around 3 to 4 minutes.
Wilson