So, just to be fair, you can't make a point for PC games' prices by assuming that console games cost 70 euros (10-15 more than they currently cost) for as long as the gen lasts. Everything's expensive if you're an early adopter or buy on launch.
PC games are at every point in their lifecycle cheaper than console games and there are far more opportunities to buy them at severely reduced rates. there may be anomalies, but this is the overriding trend.
A high-end PC from 2009-2010 might have been able to match it as it is now. My mate has a 5830 and first-gen i3 (OC'd to 4.2 GHz) that plays BF4 at 1080p med settings at 40 FPS, so a beefier card from that year might have done the job at 900p high settings. Naturally the PS4 will easily come to surpass that kind of hardware in time when more power can be squeezed out of it, but the launch multi-plats atm seem to perform at a level below comparable PC GPUs (at least with a strong CPU beside them, but I don't think CPUs are usually involved in expected comparisons: only GPUs). Must be a launch thing.
the PS4 version of BF4 is hovering around 50fps in multi-player with a mixture of settings at 900p. there are plenty of people with not even top end 2011 cards getting more out of the game than that.