The fact that you buy a specific camera does not make you a great photographer immediately. No matter which camera. You need to work on it. The first 10.000 images are the worst
I'm as S5ii user I need second camera body but I'm torn between the S1rii & S1ii
Also I want something fast enough to capture sports action & dancing.
I do not use the S1ii. I used to have the S5, S5ii and I use currently the S1Rii. The AF of the S1Rii is sufficient enough for sports photography. For sports & AF tracking there is a substantial difference to the AF of the S5ii. I am very happy with the AF of the S1Rii for field hockey. It is not Sony a1 level, but good enough.
But always bear in mind that for great sport photography shots, it all depends on the photographer, not on the camera. There have been great shot already with manual focus 40 years ago. You have to know the sport and think in advance. Choose the right lens and the right position, depending on what exactly you want to shoot. Do not run after great shots. Sit and wait for the right opportunity. Exercise again and again. No AF in the world can replace your experience after many, many exercises and sport events.
For sports photography, the ability to crop is more important than a faster AF. Depending on the size of the sport field you are planning to shoot, 40MP is IMHO the minimum. A Field hocky field has the same size like a soccer field (for adults). The 44MP of the S1Rii is "good enough" for this, although I would have preferred 60MP for this, to make prints of crops larger. But in normal daylife, I would never use a 60MP camera, because my other kind of photography does not need that much resolution. High MP sensors are a ballast for me.
I mainly shoot stills but the dilemma I'm facing is that I would love to get into printing but I'm not sure if 44mp of the S1rii is necessary.
If you want to print large, how large is this? How often do you print this maximum size? You have the S5ii already. What are you missing with 24MP resolution?
The draw back on the S1ii is that I've heard that the colors are not as good.
Never heard of that
Could someone who has experienced both cameras from a photography point of view give me some insight & clarity on some truth v fiction between these two cameras?
The S1ii has a significant better buffer than the S1Rii. This can make a difference for sports photography. But I never had a problem with my S1Rii. But I am not a fan of this "spray and pray" attitude of some sport photographers. Who wants to look later through 20.000 images of one single game? You need with both cameras the right CF express card to avoid buffer problems. Check the Panasonic site for this.
I do not know the fps of the S1ii vs S1Rii. That could be a criteria, depending on the sport. Pick the right lens for the camera. I tried many different ones. I ended up with the Sigma 70-200/2.8 DG DN sports and am very happy with it, but only in combination with the 44MP for field hockey. Otherwise I would rather need a 100-400. But this is for field hockey only. Other sports might need other lenses/distances/indoor/outdoor etc.