Compared to moderns systems the main difference is the autofocus and video capabilities. Modern mirrorless have cosmically better tracking, eye detect etc.
For instance, human eyes can't perceive the difference between a 12MP and a 50MP image printed in a poster format from a typical 1.5-2meters viewing distance and 8MP is usually good enough for most large prints.
So I would advise choosing a second hand model taking shutter count, general state, lenses quality, autofocus speed and image stabilisation efficiency as more prioritary parameters than sensor pixel count.
(The mk is the version number)
Both take excellent photos, especially in low light. I reprinted some of the original 5D photos 11”x17” and even though they have fewer pixels the quality was fine.
Canons are pretty cheap on the used market because they have a new mirrorless R series cameras/lenses so the older ones value dropped a lot.
A good lens helps a lot. Someone on the thread suggested a 50mm 1.8 “plastic fantastic”. It’s a great choice. Really sharp, lets a lot of light in, feels kind of cheap. I always liked the 24-105mm f4 zoom, but it’s pricier.
Besides the 50mm nifty fifty. There is "middle" range of "ultrasonic" zooms that are actually pretty capable and underrated/cheap. I have few for canon film cameras and their secret huge advantage is weight, optics wise they are pretty good (i have them converted on lumix full frame). I would also mention sigma 35mm art which can be get for less than 300eur and is THE lens if you know you like 35mm (person i ended up being).
On one hand, you have to remember that huge MP doesnt do much if the glass can't resolve well enough.
On the flipside, I have to note that switching to high MP full frame makes it a lot easier to do good, clean crops. Sometimes I might care about a small portion of the frame but for composition reasons (e.x. can't get closer for one reason or another) I at least can lean on cropping more.
Not sure why it is a "template".
That means a camera APS-C or micro four thirds sensor might suit better to someone who is new to photography.
Full frame is heavy yes but it can be pretty affordable (lenses from china are becoming extremely competitive).
Glass is of course important, but I’ve taken nearly all of the digital shots I’m proud of on a mkii.
(Most of the images I’ve captured that I’m truly proud of were on tmax or ektar… various camera bodies usually coupled to decent lenses )
I've tried to get Canon 5D/6D but they are becoming pretty sought after (because of the availability of lenses). Another problem is when they are sold cheap they have huge shutter counts often way after their spec lifetime. Not sure about Nikon maybe there are some cheaps. You can probably get 6D mark I with pretty high shutter count for around 200e.
Best usable 5D mark III deals i could find were around 450eur (thats camera from 2012). I ended up getting Lumix S5 (mark 1, from 2020) for like 500eur that is very different beast of a camera while having L-mount which is becoming only "open" camera mount (third party lenses are being "disallowed" by most manufacturers now).