Okay, I made a head-to-head comparison today.
Soaked the brushes while showering and then lathered up with Erasmic stick and cream (low cost überlather

)
First pass: I really couldn't tell the difference between them, backbone was equal and splay felled alike too.
Second pass: The 1305 started to splay more and felt
maybe a little more soft, but is was marginal.
Third pass: For this one I closed my eyes, twirled the handles so I didn't knew which brush was which and lathered up. I was in no doubt as to which brush was the 1305, I could definitely feel it splayed more, a little less backbone and a little softer on the tips as well. I opened my eyes and I was right
Fourth pass: Just enjoying myself here as I had the result
The 1800 feels more compact during the whole shave and it is a little more prickly, but nothing to write home about.

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