I'm not sure exactly what you mean by 'character'? That piece sounds like a complex piece to perform for clarinet. Here's one performance of the piece:
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Walter Hinteler
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Sun 12 May, 2013 11:20 am
@meganc,
There this sonata as opus 120/1 and as opus 120/2.
And there's quite a lot written about both ... even with online sources