One thing not discussed here: build quality. Higher end Cd players (should) pay much closer attention to electronic components such as caps, resistors, transformers, transistors, circuit board material, wire, etc. They should have substantial housing materials and connector terminals.
Your all-format machines such as the Marantz probably do not aspire to such build quality.
Your all-format machines such as the Marantz probably do not aspire to such build quality.