Main reason to respond here is to mention that your photos are very, very good. Gorgeous compositions, good lighting, good subject matter.
As for LR upgrade - the main thing is that by now it's unlikely that you would experience new issues making the update, but as I don't use your operating environment, needless to say I couldn't assure you of that. DeHaze is definitely worth having - it can be used creatively for purposes other than "dehazing"; I don't remember whether Guided Upright was already available in 5.7, but if it first appeared in 6, you should have it - it's a godsend. As usual there are under the hood improvements. I believe (but better check) that by selecting an option in the Adobe Upgrade utility you can retain 5.7 and upgrade to 6, so if you find you prefer 5.7 for whatever reason you can revert.