I forgot to mention the Tammy 11-16. Haven't used it but good reviews IIUC.
Looks like you've got 17mm and up covered. As mentioned previously, I'd go with something like those ultra-wides 10-20mm ballpark.
@Humayun Re: wider than 17mm too wide - do you mean on your 5D (full frame) camera, or on a crop? 10-12mm on a crop is around 17mm on a FF as I'm sure you'd know.
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