I have a number of friends who shoot weddings that say the A7sII is the best camera. I am also partial to this since I use an A7sII and love it for it's versatility. however the A7sII is a lot of money compared to the A7s but the extra features do make it worth the price. The biggest problem at first was the lens range. It took awhile for companies to start building lenses for E mounts but that problem is almost gone and if you don't want to buy new lenses you can always buy a good lens adapter that will allow you to use your canon lenses and don't even get me started on the low light capabilities.

All in all I would highly suggest the A7sII, it's has some fantastic features especially for wedding cinematography, it is on the pricey side but it's worth the money and shouldn't need to upgrade for a while.

1) Every professional film has some form of Colour grading.
2) If the movie has a bad colour grading then they probably had a bad colourist, or they were aiming for that style. Just because some films have bad colour doesn't mean they all are.
3) If you don't colour grade then you're missing out on one of the best ways to easily portray emotions.

All in all I believe Colour grading is worth the time.

First thing ideas are tricky after 3 years of writing ideas still come to me at random. My best advice is to either make up stupid stories in your head, or go out into the world and just listen. try to add story and context to the conversations you hear and the people you see.

secondly your first film will probably be bad, but don't worry every first film is bad, and it doesn't matter who's making it. My first film was a documentary and it was horrible however I learned so much from making it. Filmmaking is about learning the craft through trial and error and it takes years of practice to make a "good film" and in the end you never stop learning. Every experience is a step in the right direction.

The purpose of a picture profile is to make it easier to grade in post-production, furthermore most LUTs are designed for a specific picture profile (E.g. S-log2, S-log3), so you have to be careful which LUTs you get since they will look horrible if they are designed for a different camera/picture profile.

LUTs and Colour grading is a must, it helps to add style, theme and mood to your film. (Even for corporate) Finally it doesn't matter where you're filming if you use a picture profile then should continue using it for the rest of the filming, if you don't then things will get messy I.e colour of shots etc.

Here is a great video on Colour Grading.
https://vimeo.com/116019668

They're the same company and the same lenses.

It depends what you film. If you film a lot of action sequences then a DJI Osmo is a great camera. I know a number of people who own an osmo and I found that there's a 50/50 spilt whether they like the camera or not. It's kind of like a Go Pro it has a purpose and is good at what does but it does not always hold up to other tasks. However, I believe osmo has more practical uses due to it's size, stability and fps.

In terms of colour grading a lot of LUTs have a osmo profile since it's the same camera they use on their drones. In terms of matching the colour grading it should be doable since it's the same camera as the DJI drones.