Shout out to @BioNTech_Group who found time to answer this small time blogger's question! @hildabast I have it in writing now, a 30 microgram dose of BNR162b2 actually contains 30 micrograms of mRNA. And in addition, there are the lipids, salts, sucrose and water.
This means that by my calculations, every shot of this vaccine contains around 2000 billion mRNA strands that encode the stabilised spike protein. At 0,53*10^-21 grams per RNA nucleotide, this represents ~25 petabyte of mRNA per injection. #cantwait
If this doesn't give you the shivers I don't know what will: 
So it turns out the mRNA Spike in the vaccine is around 25% different than that in the virus itself! How can this be? The vaccine is.. codon optimized. This means the viral RNA has been replaced by synonymous RNA that is more readily translated into proteins by human cells:
The top row of letters is the vaccine, the bottom row of letters is the actual virus. ! denotes a mismatch. And the row with digits denotes "the third codon position". And you can see a near complete match between '!' and '2'
And this in turn is the codon optimization - you can typically change the third codon position at will without changing the protein. But you CAN make the RNA "look more human" this way!
A blog post is forthcoming - the codon optimization appears to have multiple functions.
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