That is a bummer in your situation but keep in mind some GH4/5 professionals have moved away from m43 glass a long time ago and use EF lenses with a SpeedBooster. There is a pretty significant percentage of GH4/5 users who already own EF glass and a good cine set from Rokinon doesn't have to be all that expensive. But yes moving to a all EF lens world from a m43 native lens world is an extra challenge for those invested in m43 glass. I think the amount of native m43 users who would realistically move to a $8,000 camera might be more of a niche market than you think however. I'm not talking those who would love to make the move but those who will actually pull out the credit card and do so without getting murdered by their significant other. Typically if somebody can afford the move to an $8,000 camera without blinking that means they pull in enough revenue each year to also not care about a set of EF lenses (assuming people in that type of market position haven't already moved to EF lenses and a SpeedBooster). Not sure where you get $14k from since a good Rokinon set of cine lenses can be had for under $2k. That puts a complete package at $10k. I'm sure you have your own unique set of lenses you feel you would need to replace. If that is the case selling your native m43 lenses is always an option.
EF lenses are honestly kind of the way to go now. BMD cameras use EF mount, Canon cinema cameras use EF mount, Panasonic Varicam and EVA1 now use EF mount. Sony cinema cameras, Sony DSLRs and m43 DSLRs are now the only ones not using an EF mount in the serious video world. Sure there is Nikon but not really a serious contended in the video world. If you ever plan on moving to BMD URSA, the Canon c200 or the EVA1 you will need EF glass. m43 will likely forever be limited to DSLR cameras and that really makes sense as EF is now kind of the unofficial universal lens standard. Like it or not it is what it is. I also love native m43 glass but it is hard to ignore the industry impact EF now has.
I don’t disagree that the move to EF glass is the current trend and that many MFT camera owners have purchased speed boosters to accommodate EF glass. For them I say the advantages in doing this are well documented.
On the other hand, for those that chose to stick with their MFT cameras and lenses remember that a really good cameraman can create world-class images with the tools he has. Throwing money at new cameras and lenses will not make you a better cameraman.
The EVA-1 is now bunched in with Canon, Sony and BMD and will stand or fall on its ability to compete. I wish it well but would have preferred MFT Cinema Camera to replace my AF100 at a price point around 4K.
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