Ballie,
You won't be dissapointed with the Zeiss........ I have a 6X24 X 56 IR Diavari, It has been tested alongside my Kahles 8X50, Swarovski 8X56 and Leica 8X42 Bino's. I can honestly say that it performs in low light aswell as my Leica's and they are awesome!

£1300 is an awful lot of money but IMO the scope is well worth it.

Take a look through Marky's and you'll be converted.

Kind Regards
Peter