Originally posted by farhagh No one "want" to shoot at that high ISO. However, there are cases in dim light that your subject moves and you need to use higher shutter speeds. The thing is may be no one though about taking pictures in those situations a couple years ago, and now it's just possible to think about and try that.
This is mostly dependent of the way you approach photography. I got fantastic wildlife picture in Tanzania with K3 and 55-300 and most of the time I was at iso 400-1600. It got out perfectly, you don't see any issue even on a 4K TV or a print.
The cityscape photo shown at the first post could have looked much better with a tripod even taken with a compact camera or a smartphone. Visibly better. It was taken at f/8 too just to show how the high iso. Nobody prevent you to use f/5.6 or maybe even the f/3.5 of the kit lens in low light if you were shooting handled.
Often people approach the thing the hard way: they go for increadbily bad situation and try to get not too terrible photos out of it and are amazed when the new gear make it look a bit less terrible. That's a way to approach it but another way could be simply to put yourself in good conditions to get the shot so you get a great shot. Not just a not too terrible shot. You could have taken the picture with better lighting a down or dusk just at the right moment and it would have looked much better...
What count is the end result. While I agree fully that the incremental improvement we get are quite nice, you need several generation for it to become a game changer. Even K5 against KP, the difference would be mostly JPEG but K20 against KP would be very visbible.
If we get 4-5 time the low light improvement from K3 to KP, then we get a game changer. We should welcome every improvement, for sure, but that doesn't require to change camera more often than every 5-10 years to get the most out of technology. People were all around K70, now KP. Both seems to have basically the same performance for high iso even if of course K1 is far ahead. Don't hold your breath all future APSC camera are going to get at least that or better and price will drop quite soon. This is technology as usual.