OK, here is an example of libertine CV. Change `sans to rmfamily if you want.
\documentclass[11pt,a4paper]{moderncv}
\usepackage{libertine} %% or newtxtext for times
\moderncvstyle{classic}
\moderncvcolor{blue}
\usepackage[scale=0.75]{geometry}
\name{John}{Doe}
\title{Title}
\address{street and number}{postcode city}{country}
\phone[mobile]{+1~(234)~567~890}
\phone[fixed]{+2~(345)~678~901}
\phone[fax]{+3~(456)~789~012}
\email{john@doe.org}
\homepage{www.johndoe.com}
\social[linkedin]{john.doe}
\social[twitter]{jdoe}
\social[github]{jdoe}
\extrainfo{additional information}
\photo[64pt][0.4pt]{picture}
\quote{Some quote}
\begin{document}
\makecvtitle
\section{Education}
\cventry{year--year}{Degree}{Institution}{City}{\textit{Grade}}{Description} \cventry{year--year}{Degree}{Institution}{City}{\textit{Grade}}{Description}
\section{Master thesis}
\cvitem{title}{\emph{Title}}
\cvitem{supervisors}{Supervisors}
\cvitem{description}{Short thesis abstract}
\section{Experience}
\subsection{Vocational}
\cventry{year--year}{Job title}{Employer}{City}{}{General description no longer than 1--2 lines.\newline{}%
Detailed achievements:%
\begin{itemize}%
\item Achievement 1;
\item Achievement 2, with sub-achievements:
\begin{itemize}%
\item Sub-achievement (a);
\item Sub-achievement (b), with sub-sub-achievements (don't do this!);
\begin{itemize}
\item Sub-sub-achievement i;
\item Sub-sub-achievement ii;
\item Sub-sub-achievement iii;
\end{itemize}
\item Sub-achievement (c);
\end{itemize}
\item Achievement 3.
\end{itemize}}
\end{document}

With xelatex, options are unlimited. Adding
\usepackage{fontspec}
\setmainfont[Ligatures=TeX]{Calibri} %% change to any available .ttf or .otf font
instead of
\usepackage{libertine} %% or newtxtext for times
and compiling with xelatex, gives

xelatexof course. Or use some other font likelibertine→\usepackage{libertine}– Mar 08 '14 at 23:09Times New Romanand family can beromanorsans serif. What exactly do you want to change? – Mar 08 '14 at 23:18\usepackage) with pdflatex, or TrueType fonts useing xelatex. – Gonzalo Medina Mar 08 '14 at 23:20\usepackage[T1]{fontenc} \usepackage{cyklop}` the font is not loaded and it falls back to the default sans-serif font.
– Ketouem Mar 08 '14 at 23:28cyklopT1 font is installed in your system, you can use it without problems. If not, you'll need to install it. – Gonzalo Medina Mar 08 '14 at 23:31cyklopfont for your CV? You must be kidding :) – Mar 08 '14 at 23:36cyklop:) I was messing around with the font settings and I wanted one that was really different from the base one in order to see if my tweaks had really an effect. – Ketouem Mar 09 '14 at 00:02cykloponly affects the default serif font. So you have loaded it for serif but then toldmoderncvto use sans which is still the default sans. Tellmoderncvto useromanrather thansansor pick a font package which redefines the sans family. – cfr Mar 09 '14 at 00:34