I voted Yes, but...
My Oppo 105 is a great player and my Schiit DAC and headphone amp/stereo preamp are quite decent, speakers are probably a bit too big for my small trailer, but sound good to me. My amp is a Fosi ZA3, and powers the speakers pretty well. Headphones are Sennheiser HD650s, so upgrading would be costly, and they also sound great to my ears. So yes, it can be improved, but I am very happy with how it is at the moment.