How much improvement would I get from upgrading a 598 to SDI and using a scaler that can do SDI to DVI or HDMI?

I just upgraded to a Pioneer Plasma and DVD's look ok, but not as good as I think it could be.

HD looks like a picture window and I've seen what DVD's can do on high-end projectors.

- Fiddler (IMHO)

If you think listening to music is fun, try learning an instrument.
HT: G61RSL, 4x5K, 5.5KHC, 2xSC6000, Transporter, HD621, Philips BDP7501 4K, Tivo, 65" LG OLED 4K C6
Computer: Foobar2000, 5K, Mojo, HiFiMan HE1000 V2