KLM has 2, maybe 3 by now. 4 were on order for delivery july, aug, sept and oct 2001.
Spotting any type of which there are so few is difficult. Ever waited for a paricular reg to turn up? You're always at the wrong runway or it is in maintenance that day...
If the airline has multiple hubs and moves aircraft around, things get more tricky still.
I was lucky to see the second KLM 739 while it was fitting out when the doors of the hangar were left open one day and I could peek in