I have been a photographer for over 40 years and I found tools don't make you better. you have to better your skills. if you have to ask about the difference between the two cameras you're not ready for that particular camera yet. With the price difference of the two cameras being such a widespread, if you went with the x4s you could purchase Mavric pro and battery for the price of the x5s. If your skill level surpasses that of the X4s, get the 5s, I got my inspired 2 in February with the x4s and have made 7k. And I fly my Mavric everyday to work on my flying skill.
Hi Bigrich007
I agree 100%. I don't believe myself or the OP would be able to tell the difference between identical photos taken with the x4s and with the x5s given good lighting conditions. Even when pixel peeping. (I still use a D2x in my studio with a Novatron light kit.) The difference is the manual control capability of the x5s to be able to get better nightshots, shallow depth of field shots, and the use of various lenses with various focal lengths. Then add on top of this all the potential video capabilities. Holly cow!!!! So that being said....... if all you are interested in is still photos, taken with adequate lighting, without shallow depth of field, and up to 4K video, then the x4s is the one for you. I do use a D800 to take photos of the local symphony. The D2x can't handle the dark at all.
Point here is that with good even light ing most cameras work well.