pjm1
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Ok, a bit of a hypothetical question here... and I'm donning a flamesuit for all the inevitable inter-brand bickering 
I currently shoot a Pentax crop K5. As a hobbyist photography with family and other outdoor hobbies, I shoot pictures of my family (studio setting and outdoors), landscapes, product shots for fun (to learn lighting) and use a mix of natural light, hotshoe flash (including off camera) and mains powered heads. My flickr links to my TP52 which is a fair reflection of the type of stuff I shoot - I'm probably not a beginner any more, but I'm firmly in the hobbyist/for-fun category and have no ambitions to leave that comfort zone.
Things I like about my current setup (in order, ish):
I'd also love slightly wider dynamic range from the sensor, especially with landscape shots.
So, a second hand 5D Mk 3? Or shell out crazier money for an A7ii? Or maybe a D810. I think I even have a Nikon lens or two kicking around from about 10-15 years ago! I don't see why I'd need 40+MP so the 5DS and A7iiR seem complete overkill and also probably £1000 more than I would theoretically need to spend.
I'd quite possibly hang on to my Pentax, especially for outdoor stuff like winter hillwalking & climbing. Losing or damaging a £250 body and a £100 lens is marginally more acceptable.
I have no brand allegiance and would basically be building up a new system from scratch... so are there particular advantages to any one system over another in terms of the models listed above (or others)?
Spending £2k-3k on a new system would have to get sign-off from the war office and there would inevitably be a discussion around spending that money on another holiday or the house... but a £1-1.5k body (2nd hand) and a couple of c. £500 lenses (again, perhaps second hand) would be a reasonable start which I think I could negotiate. And if necessary, I could flog off my Pentax gear (or at least the more expensive lenses) to recoup between £500 and perhaps a grand depending on how much of it I sell.
Thoughts?
I currently shoot a Pentax crop K5. As a hobbyist photography with family and other outdoor hobbies, I shoot pictures of my family (studio setting and outdoors), landscapes, product shots for fun (to learn lighting) and use a mix of natural light, hotshoe flash (including off camera) and mains powered heads. My flickr links to my TP52 which is a fair reflection of the type of stuff I shoot - I'm probably not a beginner any more, but I'm firmly in the hobbyist/for-fun category and have no ambitions to leave that comfort zone.
Things I like about my current setup (in order, ish):
- I'm used to how it works and adapt to its foibles (usually)
- Its weather sealing is generally very good - my first experience of water ingress (condensation rather than liquid water) was on Ben Nevis this last weekend
- I have the lenses I use most frequently and in large part I'm happy with their quality (some sharpness issues on a couple, mind)
- It won't cost me a penny to keep using it

- AF is simply not reliable - missed focus even at reasonable EV levels and usually default to single point AF and BBF... not ideal for very fast moving scenes such as those involving small children
- Being a crop sensor, there's a limit to the narrowness of DOF I can achieve if that's what I want (also Pentax-compatible f/1.4s seem to be rarer anyway)
- I do find high ISO performance is not great - above 800 ISO the noise is hard to deal with IMO
- TTL flash doesn't seem to work very well on Pentax - not that I use that very often, but I usually have to dial in compensation
- I don't feel I'm getting the most out of using a crop sensor - my longest lens I regularly attach is a 50-135mm yet I'd prefer to go wider than the 17mm wide-angle I currently have. Yes, I can buy a sigma 10-20 or whatever, but...
So, a second hand 5D Mk 3? Or shell out crazier money for an A7ii? Or maybe a D810. I think I even have a Nikon lens or two kicking around from about 10-15 years ago! I don't see why I'd need 40+MP so the 5DS and A7iiR seem complete overkill and also probably £1000 more than I would theoretically need to spend.
I'd quite possibly hang on to my Pentax, especially for outdoor stuff like winter hillwalking & climbing. Losing or damaging a £250 body and a £100 lens is marginally more acceptable.
I have no brand allegiance and would basically be building up a new system from scratch... so are there particular advantages to any one system over another in terms of the models listed above (or others)?
Spending £2k-3k on a new system would have to get sign-off from the war office and there would inevitably be a discussion around spending that money on another holiday or the house... but a £1-1.5k body (2nd hand) and a couple of c. £500 lenses (again, perhaps second hand) would be a reasonable start which I think I could negotiate. And if necessary, I could flog off my Pentax gear (or at least the more expensive lenses) to recoup between £500 and perhaps a grand depending on how much of it I sell.
Thoughts?