as well as everything has been said before, the only real improve you could have buying a new interface is in the AD/DA section.
your sound card is 48k/16bit maximum with quite old converters.
I don't know what kind of converters it mounts, how much noise they make and how much precise they are, so it's just a general speaking.
If you don't need higher performances (even if recording at 24bit should be better IMHO) and you don't hear a big difference between your interface and the focusrite then you don't need to switch to anything new.
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