You can get many C/Y Zeiss lenses for less than 500$. The 25mm, the 28, the 35 f:2.8, the 50 f:1.4, the 50 f:1.7, the 135 f:2.8. That gives you a lot to choose from if Zeiss is your cup of tea. Tell me more about your requirements, and I can supply more feeback.