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There are two problems in Contacts after updated to 5.1.1
1. Cannot be saved after editing the contact
2. No individual ringtone. Only system ringtone is used when there is in-coming call.
Perhaps some of the problems were already reported here:
/t5/Xperia-Z3-Z3-Dual/Z3-bugs-on-Android-5-1-23-4-A-0-546/m-p/1017925#U1017925
To assign an mp3 ringtone to a specific contact, you have to put it ( the mp3) into internal sd card. If you put into ext sd will not run !