What you currently have is DSD being converted to PCM within MC. That is very good quality, but it has undergone a conversion. Some people believe native DSD without conversion will sound better, but that depends on a lot of factors.
As I understand it, the 105 may not be able to handle DSD via usb, although you can test it. To do so go into Audio Options and turn on Bitstreaming for DSD. See if that works. Audio Path should change to saying DSD via DoP is being sent.
I think the 105 does do DSD via DLNA, which requires WiFi or Ethernet, but that takes more to set up. It depends on how much you want to work on getting DSD direct working.
As a test, you can put a DSD file on a thumb drive and connect that to the Oppo. That will read the DSD file directly. You can see if you hear any difference between the usb PCM signal and the DSD direct.