The ground and therefore supply noise is particularly bad around the SAA7220 digital filter, leading to its bad reputation and many conversions to 'non-OS' - you can see a badly implemented one in one of your photos (the overlong black wires).
Personally, even with the stock Philips player, I prefer the oversampled sound over NOS.
There are several other issues with the 7220 that de-optimize its performance. One main one: it being used as a clock divider (divider by 2, for the good of the downstream TDA1541 dac). But, also: the clock signal to the upstream decoder (SAA7210) being routed thru the noisy 7220.
The SAA7220 is a pretty good digital filter if implemented right. Many high-end audio companies (esp in UK: Creek, Naim, Arcam), continued to use it (with its partner TDA1541), in various CDP models, almost into the new millennium.