varicam

Are the Yashica ML lenses sharp? I'll have to make high-quality instructional videos that require somewhat close-up shots of things with fine details. I am wondering if I should invest in some prime lenses or I can get away with the Lumix G X Vario 12-35mm / F2.8 ASPH. Any insights are greatly appreciated.

Thanks for the comparison. It would be great if a comparison could also be made in a dark nightclub or something like that.

What kind of adapter do you recommend for the GH4 to use this lens?

Any info on North America availability?

I also would like to know if there is a speedbooster that works with AF on the GH4.

& Which lens do you plan to use with your GH4?

Thanks for the info. Would the LUMIX G X VARIO standard zoom lens be a good all-purpose lens for video and stills?

I am a newbie in photography and want to get a GH4 with a good lens. So this glass needs an adapter?