I think the spire looks good in this rendering. Actually even better than it would have looked without a spire (but it would be ridiculous to count the spire to the total height of the tower).
Kinda awkward with a roof height more than hundred meters lower than the total height. But who cares, no tower (Russia Tower, Spire, Shanghai Center etc.) is even close to matching the Burj Dubai anyway.
Pretty harsh on the Chicagoans getting their dick chopped off, again, though.