One day I will be Ultrman.
That was the best example of the effect I've seen, but that's substantially to do with the fact that the slightly "off" feeling was appropriate for the scene. In a different context, I don't think it would hold up in another five years.
The ethics of this are important to discuss. Casting dead actors with no way of obtaining consent is wrong. The rest is a little trickier. De-aging effects, or other facial manipulation effects don't seem to me be drastically different from extensive make-up. The result is a person who looks significantly different than they naturally would, which is par for the course for Hollywood. I am worried about the ability to "photoshop" actors in live-action for all the same reasons it can be troubling in the advertising world.
As for the quality of the effect, I haven't seen it done convincingly, but it's obviously improving. Seems to me that flesh and blood will always make for a better image.
Yeah, I forgot about this one. Great book.
Tarkovsky's book, Sculpting In Time, is far and away the most inspirational and educational book I've read on making films, and art in general. He doesn't just answer how, by why, which is a very important question. It's dense and not for everyone, but it changed my life.
David Bordwell's Figures Traced In Light is as much an educational book on blocking as it is a desperate plea to consider these old, nearly forgotten techniques. Cut less, block more.
And for a much more pragmatic book on filmmaking, Sidney Lumet's Making Movies in untouchable. He tells it how's it's done. No funny business (although lots of wit).
Avoid all screenwriting books. They're written by frauds and will lead you astray.
Now this is a reissue I'm interested in.
Not that I can afford the dang thing.
If I were in your shoes, I'd probably go with the camera. Yes, lenses tend to be a better long term investment, but it sounds like a GH5 would be really helpful for your work. Even cheaper EF primes like you're using can produce excellent images, and the features and reliability of a GH5 will help a ton and last a very long time.
I agree with Matthias though. It might be worth looking for cheaper/used lenses to fill out your range a little.