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Wow! thats a very nice image and arc! never seen a cza myself tho sadly.
I am guessing the 10 a yr, re parhelia figure tony, that is based on my very casual observations over several years, and I am talking hyperthetically, if you looked every single likelyday for them, and I dont look as much as I should or could, you could possibly see that many a year from here. I am basing this on averaging the times I see them and look for them (mostly march/april for here) X potential days for seeing them. I find lower passsing clouds are the biggest problem because they quite often occur at the same time as the sundog producing cirrus, and have blocked out many a partner of a pair, I know for sure.
Also I am basing my assumptions on frequency of these type of visual phenomena regarding latitudes, on the distribution of these images on the web and the locations they are most freguently taken from - and the best ones invariably come from latitudes over say 45º north and south - usually to do with the jet stream associated ice/cirrus I presumed?. In fact i have never seen an australian image of one from north sydney before, ever! So it seems not only do you get very nice ones, but you get arcs in the bargain! wild!
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