Originally posted by Shelly So all in all I should expect never to achieve the standards I want with what i got.
Your picture challenges that statement - most times, as in my case, it's definitely not the equipment, which sets the limits.
I'm using Rawtherapee a lot - but be prepared for a steep learning curve. New versions don't come for 32bit Windows versions anymore, but I have used
RawTherapee - RawTherapee v4.2 for a long time.
Alternatively, there are occasional free offerings from commercial software vendors - typically their previous, but they do come with free perpetual licenses. I e.g. occasionally use DXO's software in some version that supports the K-5, but not newer models. A lot of those offers are reported here in the forum, so keep your eyes open. I'm not sure how you got your camera, but the Pentax software, which comes with it, can deliver very good results too and you can start from a very similar rendering as the in-camera JPG. Usability isn't great though.