The issue is that a long way does not apply to medium format scanning...at least on the consumer level. Other than the Epson, 4990, the V700 or V800 is your next upgrade. They are good enough for medium format. If you need better scanning quality, you need to go for the more expensive options, but very few options.. Nikon Coolscan or the Plustek model. That's about it. Next step up would be the drum scanner from Hasselblad.....
For the same reason, I switched to DSLR scan my medium format negatives...when I was still shooting in medium format. However, the process of DSLR scanning is too involved for me. I needed to construct a DIY light box mounted on a light stand. Then, I have to tape down my 6x6 strip on a piece of cardboard with the middle part cut out. Mount my DSLR with a 105 sigma macro lens on a tripod. Aligning everything. I could take one exposure for a 5000 pixel resolution "scan." Or two exposures to stitch them up for a higher resolution.
I would then open up my raw editor to correct any color shifting due to the incorrect light color temperature of my light (this involving matching all the RGB channels to match and overlapping one another for the correct black and white white balance). Afterward, I would load the tiff files to VueScan and to invert it and to apply various BW film profiles. Then, load the inverted tiff file to CC for the final edit of the scan.
I wish I had a better way to simplify the DSLR scan workflow. I may have been still shooting in medium format. Right now, is all 35mm for me.