I have been researching iMacs and I came across a question. I know that Apple stated that the pure SSD options in the current iMacs feature a faster SSD than previous years models, but they made no mention of the fusion drive models. My question is, is the SSD portion of the fusion drive in the late 2014 retina iMac any slower than the SSD portion in any of the late 2015 fusion drive options? Or are they the same? And if so, by how much? I think this would be good information to consider and I just can't seem to find the answer online anywhere.