I'm surprised no one has mentioned the only direct competitor to the 4900 - the Canon iPF5100 - which has all the Epson features and more: 12 inks with auto, lossless black switch, and most importantly, thermally activated head nozzles with a huge auto-remapping redundancy for burned-out nozzles. Heads fail eventually when spare nozzles are exhausted, but heads are user-replacable at about $400 each (2), generally lasting several years.
What this means is total freedom from nozzle check prints and no forced cleaning cycles. Yes, TOTAL, until a head error message comes up and time for head change (takes about 15 minutes). In my iPF5000 the original heads were replaced under warranty at 11 months with the current PF-03 heads, which lasted five years. When those eventually failed I upgraded to the 5100 over two problem-free years ago and going strong. The $1500 printer cost was close to the retail cost of just the two heads and the twelve 90ml starter carts (replacements 130ml).
I know you're concerned about printer IQ, and I'd be happy to mail you 12x16 prints of the two printer test images I use - Outback's and Digidog's composits - or any of your choice, on my RR UltraPro satin proofing roll paper, which matches my Ilford GFS presentation paper quite nicely.
Pete