>>2998672Yeah but those rugged high speed cameras are what Nikon and Canon made their names with, and bodies of that type are still their flagships.
Studio/portrait cameras are a different story but traditionally that's MFs realm. Sony has started to find a niche there but they still need to produce a viable photojournalist camera if they really want to be taken seriously as a "pro" brand. Nobody's going to hang up their D5 or 1DX in exchange for an A7 unless they didn't need their DSLR in the first place.
As it stands, the A7 is more like a D600 or 6D in terms of build quality and durability anyway, it can't even compare to the second-tier DSLRs for viability in the field. Even the D600 has dual slots, as well, and that's absolutely vital for professional use in this day and age.
As for those 400 shot rolls, pros weren't using them, but they sure went through a ton of rolls in a day of shooting. Besides, standards have changed, compare award-winning sports photos of the '80s with those of today and it's night and day, and a lot of that is camera capabilities.
It's also notable that batteries themselves were an issue in the old days too, and many pros stuck with F2s for decades because they could be used without batteries. Battery life on digital isn't just about ripping through hundreds of shots in a sitting, it's about being able to go out into the wild for days or weeks at a time and keep working while far away from reliable electricity.
