Have not seen any such direct comparo yet in the European press. What I have read is unanimous praise for the Street Triple.
The Shiver, by way of contrast, has elicited much scepticism ("high on technology but low on personality"... or... "not bad but bland"... etc.). One European weekly (not an Italian one!!!) even suggested that the Shiver, some elements af it, at least, be taken back to the drawing board.
And it seems to me that Aprilia might indeed be fine tuning the Shiver before shipping it to its dealers. Jamie