"the HF-2 on the other hand sounds incredibly forward to me, "
True, it sounds like you're in the front row, rather than the HD600's presentation of 10 rows back.
Turn the volume down a tad and it's more liveable and there's still more detail than the HD600.
In spite of all this, my first pair of HD600's is my standard headphone for general use.
For more in-depth listening it's a bunfight with the HD800 still my favourite can.