Originally posted by cport Yes, apart from shorter battery life and the top display, K-70 is a very good upgrade of K-5 in almost every aspect.
With "almost" being significant!
I took this path, and my K-70 gives me some fantastic images, but I've had to learn how to hold the little thing! By making the K-70 more compact (which caused the loss of the top display) the camera is now much more critical to hold correctly ... especially noticeable when using a long telephoto.
In it's default configuration it's far too easy to depress the directional controls on the rear of the camera with the ball of my thumb, thereby changing some setting or other unintentionally, so not taking the picture I expected, or having the menus flashing away in the bottom of my line of sight and distracting me from what I'm trying to look at through the viewfinder.
Fortunately this problem can be resolved (mostly) by a menu setting to disable these controls (which isn't very well described in the manual)!
Also, there are occasions where I miss some of the extra knobs and buttons on the K-5, being able to change the AF-point selection or the metering mode without having to take the camera from my eye and start driving menus (which may not be easily read, depending on the ambient lighting conditions). The "Green Button" is also less optimally placed, in my view, having moved from "under the thumb", where it's always been, to the top plate.
However, the 16 to 24 Megapixel upgrade is very significant if you want/need to crop heavily and the K-70 has much lower noise at high sensitivities and is currently very well priced, I'd certainly recommend the upgrade if these aspects are important to you. However, if you regularly fill your viewfinder with subject matter in good light you may well not notice the difference, the K-5 is still a very competent camera!