Begonienforum Schiefblatt

Caro · Mitglied Beiträge: 646

First, B. scharffii and B. scharffiana are synonyms.
http://ibegonias.filemakerstudio.com.au/browserecord.php?-action=browse&-recid=4660&-recnum=1

B. scharffii has smaller leaves than B. 'Credneri'.
I shared a picture of both close together in this thread:
http://www.carookee.de/forum/Schiefblatt/13/30766717#30766717

Your plant could be B. 'Credneri', but I`m not sure as the leaves of your plant look a little different in shape from mine.