QA660 SD Card transport approaches very best as a digital source

[KaneWilliams]

This machine does in fact have an 2.8 inch AMOLED! Also, the S1 & X6 are similar devices in the same price range (X6 cheaper).

 

[KaneWilliams]

What about using a Filo X5 or iBasso DX50 or HDP-R10 as a source? Will either of these be as good? Both offer DSD as well.