The main benefit of N-up is to cut paper costs. For example, you can cut down your paper cost by 50% with 2-up printing / copying, and 75% with 4-up printing / copying etc. This feature is also useful for producing handouts and presentation notes.
some printers support N-up printing, but I just want to tell [...]

Glad to know iTextSharp is used in SharpDevelop Reports, because iTextSharp supports CJK(maybe I should say it supports all encodings).
I downloaded SharpDevelopReports_2.2.0.263_Source and had a test, it does not support Chinese Characters, so I reviewed the source codes, I found the following lines,
[...]

From the SharpDevelopReports forum, Peter Forstmeier said “i’m switching from PdfSharp to itextSharp“.
from SharpDevelopReports Roadmap, it says “Change from PdfSharp to iTextSharp”.
btw, I attach some info about SharpDevelopReports,

SharpDevelop Reports (SDR) is the open source .NET reporting solution formerly known as SharpReport. It started as an integrated part of SharpDevelop, but it is now developed [...]