Well thats fair enough Jim. 
But no point in saying you don't buy it unless you give your reasons.

Please explain what advantage the F2.8 lens has, and contribute to the thread in a constructive way to answer Tom's question.

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html