No you wont get an effective shock. that is how birds can stand on 11,000 volt power lines. And how hair raising demonstrations of static electricity can be performed safely.
BUT it is NOT sensible to touch or work on live wires. Even if you are not touching anything else ( work with one hand in pocket ) you have to remain fully alert that nothing and no one makes contact with you.
And if you get a none fatal finger to finger shock your reaction may make you move in a very dangerous way.
Only because air is a far superior insulator than plastic soled shoes if the wire was at 11,000 volts potential i don't think it would matter whether he was touching anything else at the time.
Get one of those neon screwdrivers that you love to hate and have a play with it, most of the time you'll find it still works even when wearing rubber shoes, and sometimes even if you are stood on a wooden chair!
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