not really no... the ess you have in the 105 is decent for sure. I use an external, so for me its more about the movie performance upgrade. I think there may have been a 'mechanism' difference between the 103/105 and the 203/205 which would help... but I cant find any info on that.
I do know there is, in my ears, an upgrade to having multiple DAC chipsets separated between LR as a general idea, but I dont know for sure if the 205 had multiple chipsets... like I had said, i dont use the internal DAC