I got a chance to compare Samsung internal DAC, with Onyx, Denafrips Terminator and Topping D50. Honestly, I was still struggling to notice any difference. If at all may be very minor. Not a night/day difference.
When comparing Samsung transport vs Esoteric. I did feel that the Esoteric CD player (via Optical) sounded a bit better than the Samsung (via Coax). The Esoteric and the Onyx are both 50x the price of the Samsung.
The Exposure amp made a more noticeable difference in my setup. Exposure added clarity, separation and a bit more soundstage. But I feel that the clarity could get fatiguing after some time. It would be great to have the sweetness of the tubes with better separation and improved soundstage of the Exposure.
For now I'll stay with the Topping.