The differences are as follows:
HFI-580
Frequency range 10-22.000 Hz
Impedance 32 Ohm
Sound pressure level 101 dB
Driver 50 mm Mylar
HFI-780
Frequency range 10-26.000 Hz
Impedance 35 Ohm
Sound pressure level 96 dB
Driver 40 mm gold-plated
THe HFI-780 isn't an improvement, so to speak, over the HFI-580. They're 2 different types of headphones with different characteristics.
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