Topping D50 vs Schiit Modi Multibit vs Topping D30 vs SMSL M8A DAC

Have someone heard and compared these DACs?

1-Topping D50
2-Schiit Modi Multibit
3-Topping D30
4-SMSL M8A DAC

Which of them DACs stand above and does outperform the others in terms of audio quality?

Thanks