What is the difference in flavour between the zest of an orange vs lemon vs lime
If you can't taste it, but others can, chemical composition of the essential oils might prove a useful guide for you.

Ingredients of Orange, Lemon and Lime oils: 

First line shows components common to two or more of the fruits. Second line shows components unique to each fruit.

lemon oil 

a-pinene, b-pinene, myrcene, limonene, linalool, sabinene, neral

camphene, a-terpinene,  b-bisabolene, trans-a-bergamotene, nerol

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Lime oil

a-pinene, b-pinene, myrcene, limonene, linalool, 

terpinolene, 1,8-ceneole, borneol, citral and traces of neral acetate and geranyl acetate.
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orange oil 

a-pinene, myrcene, limonene, linalool,  sabinene, neral

citronellal, gerania

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Looking up the flavors of the unique ingredients should provide a better, more useful answer than 
"full flavour with sweetness" or "sharp and sour". Looks like the Handbook of Fruit and Vegetable Flavors would be a good place to find this information, but it's a bit on the pricey side.