Quoted from Audiblog.nl:
Audi Q5 2.0 TDI quattro 6-Speed Manual 125 kW (170 PS) € 38,300, --
Audi Q5 3.0 TDI quattro S tronic, 7-Speed 176 kW (240 PS) € 47,400, --
Audi Q5 2.0 TFSI quattro S tronic, 7-Speed 155 kW (211 PS) € 42,350, --

That is €5000 more than the equal engined A4... Although the Q5 has S-tronic, where the A4 only has a normal auto.

Hello

If you consider that in Germany an A4 3.0 Tdi Quattro Tip-Tronic (6 gear) is worth about 44,700 Euro, the difference really narrows down to a little less than 3,000 Euro :)