Um, can't really compare Df to D610, Df doesn't have D610 guts, it's got D4 guts at less than half the price.
You seem to be one of those folks for whom "sensor" is synonymous with "camera." Do you make camera purchase decisions based solely on DxOMark Sensor Scores? FYI, there's more inside a camera than the sensor. Let's look, shall we?
D4 Df D610 Like D4? Like D610?
Sensor 16 MP 16 MP 24 MP ✓
AF points 51 (15 cross) 39 (9 cross) 39 (9 cross) ✓
AF sensitivity -2 EV -1 EV -1 EV ✓
Metering sensor 91,000 pixel 2,016 pixel 2,016 pixel ✓
Max shutter 1/8000 s 1/4000 s 1/4000 s ✓
X-sync 1/250 s 1/200 s 1/200 s ✓
Exposure Comp ±5 EV ±3 EV ±3 EV ✓
Look at that list, and explain how the 'guts' of the Df are more like the D4 than the D600/610...
Allow me to repeat my earlier statement, with a few modifications: What Nikon has done here is analogous to taking a modern, powerful, fuel-efficient engine, (the D4 sensor), handicapping that engine with a three speed transmission (the D600/610 AF sensor, metering sensor, shutter assembly, etc.)...putting it into a Subaru Brat...and slapping on a Mercedes price sticker.
Hmm, and are you one of those folks that thinks something other than the sensor is the real heart and soul of a camera?
Think back to film SLR days, one could and did change image characteristics by changing film. We can't do that anymore. You, well maybe not you, I select sensor characteristics, then accept the body that sensor comes in.
Nice chart, hope it wasn't too much work.
AF is only wishfully mature, it's really still an acne faced adolescent.
Make a guess please, what percentage of threads here on CR are expressions of exasperation with AF performance, 15%, 30%, more? Less? There are a lot, whatever the percentage is.
I have to bite my fingertips every time I see any complaint about AF performance, I really want to type out advice about learning how to quickly and accurately take over from AF P&S, get to manual focus and get the shot.
Poke around, select individual points? Really??? You've got time for that? You practice that?
Why is AFM now built in? Because AF technology is still immature, it should just work making that DSLR AF function as simple as P&S.
Manual focus, just take over at the first sign of the AF gimmick's failure to perform.
So, all the AF point differences listed in your chart are relatively low weight.
Yup, the metering number differences in your chart look huge, do they mean much to the final exposure? Seems to me that selecting the final exposure variables is one of the things that sets photographers apart and above iPhone shooters.
How's the weight of metering number differences holding up now?
The rest of the chart, nits, no, not nuts, nits.
Automotive analogy, really Neuro, as long as you've been here, you should know better.
Sure, let's take the latest Corvette engine, stuff it in the back of a Brat, but let's just use a two speed PowerGlide, step out of the way please, no MBZ price tag involved. We do want to jack in some good brakes.
A better automotive analogy to what Nikon has done with this Df, would be taking something like say, a '67 Fairlane Convertible to a tuner shop like Roush, Saleen or Hurst, install the mechanical guts from a 2013 Mustang. You'll still have to put the top down by hand, adjust the mirrors by hand, no power locks, no automated climate control, just basic A/C, no computer controlled seat adjusters, no computers at all excepting those needed for engine management.
All that said, previous experience wearing out two Nikon DSLRs causes me to (currently, subject to change as absolutes are) never ever want to own another Nikon.
Even with that said as a former Nikon fan, I definitely think the Df is cool stuff, even better if it inspires Pentax to a FF digital LX.
Um, er, only 50 some posts, I've drawn Neuro's ire already, oh my......