The 5400 is much better than the 777 or scd-1 especially on redbook.
Sure, the inferior 5400 transport gets backed by "superior" Digital Signal Processing (DSP) that is not even Sony! It is Matsushita/Panasonic. Yes, Sony has outsourced this to a larger/cheaper manufacturer (with Burr-Brown DACs)!
While I'd agree that the 5400 is better (stock), it has nowhere near the potential of SCD-1/SCD-777, sorry to say!
IMO, of course, as usual!
Best,
Alex Peychev